Tonyrodz
Resident Resident
My 03 isn't flex fuel, so I guess no e85 for me.
Useless Information
- Thread starter swathdiver
- Start date
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Tozan
Overlander
I have 4.10 gearing with 34.6 inch tires and a 4 inch lift.
I just drove from Reno to Huntington Beach, my over all average is 16.8 MPG after 3 tanks of fuel mostly highway with about a 100 miles of city driving.
On my first tank with regular grade fuel with 0% alcohol I averaged 18.3 MPG up and down mountains.
The last two tanks had 10% alcohol in the fuel and the average dropped down to 15.6 mostly on flat ground and lower altitudes.
Return trip:
I will be switching from my economy regular fuel tune to a 93 octane high performance tune and running 10% alcohol on the return trip. I will also be driving at high desert altitudes (4000 to 5000 feet)
I just drove from Reno to Huntington Beach, my over all average is 16.8 MPG after 3 tanks of fuel mostly highway with about a 100 miles of city driving.
On my first tank with regular grade fuel with 0% alcohol I averaged 18.3 MPG up and down mountains.
The last two tanks had 10% alcohol in the fuel and the average dropped down to 15.6 mostly on flat ground and lower altitudes.
Return trip:
I will be switching from my economy regular fuel tune to a 93 octane high performance tune and running 10% alcohol on the return trip. I will also be driving at high desert altitudes (4000 to 5000 feet)
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swathdiver
Full Access Member
Thanks for the reminder! I'll not use those little bottles until back on 93.
Looking forward to your results former neighbor!
Tozan
Overlander
I drove the eastern Sierras high desert plains 4000 to 5000 feet altitude on my return trip driving hwy 14 and route 395.
The over all average was 16.6 mpg on the return trip.
In the flat areas I was averaging 18+ mpg.
In the mountainous areas the average was about 14 mpg.
All total for the entire trip both directions.
1385 miles
85 gal fuel
16.3 mpg average
Pretty good for going from 5000 feet to 8000 feet then sea level and back to 8000 then back to 5000 feet. So a lot of mountain driving and a lot of somewhat flat ground. In one direction the flat ground was low altitude and the return trip high altitude.
I noticed it does the best around 1700 rpm so my gearing is still a little deep for best fuel economy however it pulls great and going from 60 to 90 mph takes only seconds at full throttle. When I get new tires (at least year from now) I will get something a little taller maybe 35 or 36 and the gearing should be perfect for fuel economy.
The over all average was 16.6 mpg on the return trip.
In the flat areas I was averaging 18+ mpg.
In the mountainous areas the average was about 14 mpg.
All total for the entire trip both directions.
1385 miles
85 gal fuel
16.3 mpg average
Pretty good for going from 5000 feet to 8000 feet then sea level and back to 8000 then back to 5000 feet. So a lot of mountain driving and a lot of somewhat flat ground. In one direction the flat ground was low altitude and the return trip high altitude.
I noticed it does the best around 1700 rpm so my gearing is still a little deep for best fuel economy however it pulls great and going from 60 to 90 mph takes only seconds at full throttle. When I get new tires (at least year from now) I will get something a little taller maybe 35 or 36 and the gearing should be perfect for fuel economy.
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swathdiver
Full Access Member
One of our daughters is taking her driving test Friday so this afternoon we headed out for some more practice parking. This dropped that particular tank's average economy down to 11.30 on E85. After fueling we hit the highway and took some notes. At 65 mph the truck got 16 mpg, 70 mph about 15 mpg and 75 mph gave us 14.5 mpg, all on E85.
2008 and 2010 models of the GMC Yukon XL 4WD show both getting 11 City and 14 Hwy on E85. The former with a 4-speed transmission, the latter with the 6-speed and VVT added to the engine and a different camshaft profile. There is no official published MPG for 2009 trucks in the GMC brochures or even my particular truck on fueleconomy.gov. My window sticker with regards to fuel economy is blank. You know who was President then. Anyway, this thing is getting regular mileage on E85 but not on 93.
2008 and 2010 models of the GMC Yukon XL 4WD show both getting 11 City and 14 Hwy on E85. The former with a 4-speed transmission, the latter with the 6-speed and VVT added to the engine and a different camshaft profile. There is no official published MPG for 2009 trucks in the GMC brochures or even my particular truck on fueleconomy.gov. My window sticker with regards to fuel economy is blank. You know who was President then. Anyway, this thing is getting regular mileage on E85 but not on 93.
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swathdiver
Full Access Member
When my daughter and I concluded our driving test practice the other night, after refueling and returning home we were at 14.3 mpg. My lovely wife borrowed the truck today and returned it averaging about 9 mpg! She said it was too much fun driving it, the truck just wanted to keep going faster and faster and she liked the engine sounds it made every time she took off! LOL
Ohh, something else I forgot to mention earlier. Did some more poking around about spark plugs and came across some posts where fellas mentioned degraded fuel economy with the new 41-110s versus the 41-985s that their trucks originally came with. No misfires, no noticeable loss of power, just a slow and steady decline in fuel economy after about 20-30k miles with the new plugs. The gap issue is not relevant is these instances either.
So having said that, this reminded me of the experimenting with plugs we did back in the day with our race cars. They didn't misfire or have a noticeable loss of power but when I switched from the factory plug to the then new NGK Splitfires ( I think that's what they were called) the cars picked up about 5 horsepower but lost 3 miles to the gallon in economy.
One other thing some of the men mentioned above had in common was factory K&N air filters. Many people swear the oil coats the MAFs and kills performance. My experience has been the opposite. However, I've never seen the same mileage as the truck did when it had the paper air filter and those Load Range E tires, 17-18 @ 80 mph for 700 miles.
My little helper is turning into young lady, getting her driver's license today and not so sure she'll be around to help old dad with the truck anymore! Time to train up number 3!
Not totally useless information, well, maybe.
Ohh, something else I forgot to mention earlier. Did some more poking around about spark plugs and came across some posts where fellas mentioned degraded fuel economy with the new 41-110s versus the 41-985s that their trucks originally came with. No misfires, no noticeable loss of power, just a slow and steady decline in fuel economy after about 20-30k miles with the new plugs. The gap issue is not relevant is these instances either.
So having said that, this reminded me of the experimenting with plugs we did back in the day with our race cars. They didn't misfire or have a noticeable loss of power but when I switched from the factory plug to the then new NGK Splitfires ( I think that's what they were called) the cars picked up about 5 horsepower but lost 3 miles to the gallon in economy.
One other thing some of the men mentioned above had in common was factory K&N air filters. Many people swear the oil coats the MAFs and kills performance. My experience has been the opposite. However, I've never seen the same mileage as the truck did when it had the paper air filter and those Load Range E tires, 17-18 @ 80 mph for 700 miles.
My little helper is turning into young lady, getting her driver's license today and not so sure she'll be around to help old dad with the truck anymore! Time to train up number 3!
Not totally useless information, well, maybe.
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PG01
Supporting Member
Some more useless info for you guys....
@swathdiver @iamdub
Long drive yesterday, got in truck loaded up wif and kids to south jersey, to see my father who sadly, is dying...anyway got in truck had 1/4 of a tank and was at 11.3......wife drove last hence the lower economy and no gas.....i fill it up with sunoco 93 got on the road. 2.5 hr drive and had it up to 19.3 @73 mph , seemed to be the # that it wouldn’t drop or go up anymore and as i got closer to my destination more traffic less highway shut it off @18.5. Got in the truck 3 hrs later and started to next destination, Rockefeller center NYC. Lots of traffic to the outerbridge crossing, through staten island ( @Kenny D i was looking for ‘LARRY!!!’ My kids were cracking up as i had the window open yelling LARRY), over the verrazano into Brooklyn, by Barclay center, up the BQE, into queens through the Brooklyn-Battery tunnel into lower Manhattan past World Trade Center Memorial and 1 World Trade up the West Side Highway to midtown, cut across in the 50’s parked the truck on 54 and Ave of the Americas and was at 15.5 on the dic. Used the bathroom in the Hilton, walked up to St. Patricks Cathedral, lit a fews candles, prayed for all you heathens....lol just kidding... did sit there for 1/2 hr and headed to see the Rockefeller tree. Walked around took a bunch of pics, went to lego store, dropped some money in there, went into saks 5th ave, more money, watched the light show outside and window displays, American girl doll store, more moolah, hit the Hilton b-room again and headed home up west side highway into westchester (yonkers) across Tappen Zee (@Cattivo ) up the NYS thruway back to good ol’ Montgomery. Gassed up because now at 1/4 tank and took 21.39 gals, highest dic went was 16.8 on trip home, 16.5 at gas station) whole trip was 346.4 miles(which according to my math is 16.1 mpg). Truck turned 61k and ran like a champ all day, trans temp kept between 99-115, ambient temp was 6-14, brrr, oil press @ just under 40 psi and temp right at 210. One thing I noticed is a slight whine from ds front (everyone fell asleep and no radio) sounds like hub but I will investigate further today or tomorrow. Good day, trip and time over all. My father is half man he ever was and it’s killing me, but he lived his life and he will be with my mother which is how it should have been for the last 23 yrs.
Happy New Year fellas.
@swathdiver @iamdub
Long drive yesterday, got in truck loaded up wif and kids to south jersey, to see my father who sadly, is dying...anyway got in truck had 1/4 of a tank and was at 11.3......wife drove last hence the lower economy and no gas.....i fill it up with sunoco 93 got on the road. 2.5 hr drive and had it up to 19.3 @73 mph , seemed to be the # that it wouldn’t drop or go up anymore and as i got closer to my destination more traffic less highway shut it off @18.5. Got in the truck 3 hrs later and started to next destination, Rockefeller center NYC. Lots of traffic to the outerbridge crossing, through staten island ( @Kenny D i was looking for ‘LARRY!!!’ My kids were cracking up as i had the window open yelling LARRY), over the verrazano into Brooklyn, by Barclay center, up the BQE, into queens through the Brooklyn-Battery tunnel into lower Manhattan past World Trade Center Memorial and 1 World Trade up the West Side Highway to midtown, cut across in the 50’s parked the truck on 54 and Ave of the Americas and was at 15.5 on the dic. Used the bathroom in the Hilton, walked up to St. Patricks Cathedral, lit a fews candles, prayed for all you heathens....lol just kidding... did sit there for 1/2 hr and headed to see the Rockefeller tree. Walked around took a bunch of pics, went to lego store, dropped some money in there, went into saks 5th ave, more money, watched the light show outside and window displays, American girl doll store, more moolah, hit the Hilton b-room again and headed home up west side highway into westchester (yonkers) across Tappen Zee (@Cattivo ) up the NYS thruway back to good ol’ Montgomery. Gassed up because now at 1/4 tank and took 21.39 gals, highest dic went was 16.8 on trip home, 16.5 at gas station) whole trip was 346.4 miles(which according to my math is 16.1 mpg). Truck turned 61k and ran like a champ all day, trans temp kept between 99-115, ambient temp was 6-14, brrr, oil press @ just under 40 psi and temp right at 210. One thing I noticed is a slight whine from ds front (everyone fell asleep and no radio) sounds like hub but I will investigate further today or tomorrow. Good day, trip and time over all. My father is half man he ever was and it’s killing me, but he lived his life and he will be with my mother which is how it should have been for the last 23 yrs.
Happy New Year fellas.
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swathdiver
Full Access Member
Thanks for sharing Pete! It's been 18 years since my wife and I spent Christmas in New York. She's from the Bronx and was just saying it was time to spend Christmas up there again with family. Sorry to hear about your father. Mine are getting on in age, in the last three years we lost three uncles. My wife and I try to be very accomodating with regards to our children spending time with our folks so they'll remember them, learn from them, and know why we are who we are and give them a chance to pass down traditions and recipes and such.
Tozan
Overlander
I installed a set of EBC front rotors and a set of yellow pads on both ends. With my larger heavier tires the braking had gotten softer but, after I up graded to these pads the braking improved to better than before. I highly recommend the Yellow pads.
Tozan
Overlander
Hey James I read you needed a tire winch if the 2011 Tahoe part will fit yours I have one I removed from mine you can have it....
Also if you want to raise and level your unit. I have a never used CCM level lift kit I need to sell. It is Part number CCM071500-SUV it is supposed to fit 2007 up.
If you want both I would like $130.00 plus what ever shipping will cost.
Also I was wondering what size tires are you running? I also have let mine idle and it tends to kill my millage when I do that.
Also if you want to raise and level your unit. I have a never used CCM level lift kit I need to sell. It is Part number CCM071500-SUV it is supposed to fit 2007 up.
If you want both I would like $130.00 plus what ever shipping will cost.
Also I was wondering what size tires are you running? I also have let mine idle and it tends to kill my millage when I do that.
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