swathdiver
Full Access Member
2009-2014 L9H and L94 are FlexFuel engines. The L92 should not really see more than 15% alcohol content as its injectors are not large enough.
E85 + 87 = better than 93?
- Thread starter HACK BLOCK
- Start date
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2009-2014 L9H and L94 are FlexFuel engines. The L92 should not really see more than 15% alcohol content as its injectors are not large enough.
HACK BLOCK
Full Access Member
mine is flex fuel
HACK BLOCK
Full Access Member
in my first comparison of running e85 its working out to 8 cents a mile cheaper than 93
swathdiver
Full Access Member
Here are my averages since October 2017:
This is a relation of Alcohol Content and MPG since March 2018:
swathdiver
Full Access Member
Well, I think I blew the mix today. Pumped in 7 gallons of E85 and ran over to a nearby Chevron as they were selling 93 less than everybody. Hit every light and had to stop for the entire county's fire department it seemed! Probably burned over a gallon of that stuff off before the 93 went in.
Last fall that Racetrac's E85 was 72% and the other day that Chevron's alcohol content was 5%. Instead of 20%-22% she settled in at 15%. Mileage was up though, 18.4 mpg and it was hot out, starting at 99 and cooling to 95 the further north we went towards home. About an hour's worth of idling brought the mileage down to 15.8 mpg.
I was cruising at 60 in the right lane and punched it til just under 70 mph and picked up 5 degrees of knock retard. Seems like I'm the retard! Should have stuck with straight 93 this time. The octane rating should be somewhere between 94-95 I think and that E85 must've been 51% at best.
Well, we shall see how that tank plays out mileage wise. The last one broke some records for gasoline!
Last fall that Racetrac's E85 was 72% and the other day that Chevron's alcohol content was 5%. Instead of 20%-22% she settled in at 15%. Mileage was up though, 18.4 mpg and it was hot out, starting at 99 and cooling to 95 the further north we went towards home. About an hour's worth of idling brought the mileage down to 15.8 mpg.
I was cruising at 60 in the right lane and punched it til just under 70 mph and picked up 5 degrees of knock retard. Seems like I'm the retard! Should have stuck with straight 93 this time. The octane rating should be somewhere between 94-95 I think and that E85 must've been 51% at best.
Well, we shall see how that tank plays out mileage wise. The last one broke some records for gasoline!
HACK BLOCK
Full Access Member
how do you know the percentages
gooffeyguy
Tom
You can use something like the Tech2 diagnostic tool, or even a decent OBDII dongle that connects to your phone via Bluetooth and uses an app like Torque
2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18
gooffeyguy
Tom
So you had 7 gals of E85 and 20ish gals of 93 and still had spark knock? Why would replacing that 7 gals of E85 with 93 help with that? I'm confused!
2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18
swathdiver
Full Access Member
We're guessing before it goes in and measure it after it goes in. Good scan tools can read alcohol content and you can even buy a little bluetooth obdII adapter and use the torque pro app on a phone to view it and codes.
No it was me not thinking right and frustrated. Too much traffic and way too many knuckleheads on the road today. I guess it was just too hot outside for the tune and I only did it once. I really need to record it or have someone watch it while I'm driving, it seemed to pull timing back at the top of the gear or right as I was letting off the gas. Not really a good test, didn't repeat it because of traffic. Did I tell you that I hate traffic? I love to drive but not when people are on the road! Like to be off the road when people are going and coming from work.
