GM lying about fuel rating, or i drive it too hard?

[Quark]

Speed, temperature, terrain, tire pressure and brand of gas all affect my gas mileage.

I'm starting to see these around town and by golly they're huge so I'm not surprised we're seeing less good gas mileage. Why did GM make them so darned big? The last model was more my preference how about anyone else?

 

[Joseph Garcia]

I've never achieved EPA rated mileage in any vehicle. On the other hand, I've really never cared about gas mileage, particularly with my truck. It is just too much damn much fun to drive, and if I tried to improve my gas mileage, it would take all of the fun out of driving for me.

 

[OR VietVet]

What @Joseph Garcia said. I like the fun factor over saving a few pennies per gallon.

 

[ktpinnacle]

Speed, temperature, terrain, tire pressure and brand of gas all affect my gas mileage.

I'm starting to see these around town and by golly they're huge so I'm not surprised we're seeing less good gas mileage. Why did GM make them so darned big? The last model was more my preference how about anyone else?

All vehicles are getting larger/longer. My 2001 Yukon is the same length as the current Exploder. A 2020 Accord is less than 6 inches shorter than that same Yukon.

I agree. I like the length of my 2001 Yukon, even though it's third row and rear storage is a compromise. I can parallel park it like a small car (without the electronic nannies!). But I'll be getting a new Yukon anyway.

 

[Fireman591]

When my GMC Terrain's engine was damaged during break in from fuel contamination from a faulty high pressure fuel pump seal GMC would not honor the gas mileage. The 4 cylinder was suppose to get 30 mpg on the highway. We were getting around 18 mpg at 70 mph. GMC stated that at 50 mpg with no wind on level ground they were getting close enough to 30 mpg not to repair our engine. You would think pulling 8 quarts out of a 4.2 quart capacity engine would be a concern to them but their first response to me was " It is normal to have some fuel in your oil" LOL Needless to say I bought a Honda Pilot after that

 

[cardude2000]

Hello guys! This is my first GM vehicle, My LT has 5000 km on it now, no towing, most on highway and never had jammed traffic. and i just check the trip computer today, and i got 18L/100km.. Their website claim fuel consumption as 11.8L/100km Highway and 14.3 city (I am in Canada, if goes to mpg should be 15/20).

GM is the best. Their vehicles are deities. GM would never lie to us. You shouldnt worry about mileage. Your truck is great. This is your fault. Or Fords. But certainly not GMs. ;-)

 

[ktpinnacle]

Hello guys! This is my first GM vehicle, My LT has 5000 km on it now, no towing, most on highway and never had jammed traffic. and i just check the trip computer today, and i got 18L/100km.. Their website claim fuel consumption as 11.8L/100km Highway and 14.3 city (I am in Canada, if goes to mpg should be 15/20).

The considering the mileage numbers are generated by the EPA/DOT, I'm not sure what the claim is here - that GM provided doctored vehicles to produce optimistic numbers?

Car manufacturers have generated high mileage numbers before. I received a very nice debit card in the mail for a 2012 Kia Soul that never got the mileage promised. Not sure how that lawsuit was generated or settled, but I enjoyed using the $600 cash settlement (the only real cash I've ever received in a class action).

 

[ohmygoodness1]

Hello guys! This is my first GM vehicle, My LT has 5000 km on it now, no towing, most on highway and never had jammed traffic. and i just check the trip computer today, and i got 18L/100km.. Their website claim fuel consumption as 11.8L/100km Highway and 14.3 city (I am in Canada, if goes to mpg should be 15/20).

Not sure how much this is worth as we just rented a 2020 Yukon XL. Drove from Toronto to Montreal with it fully loaded (wife, 2 kids, dog, skis and a lot of cargo). I wasn't taking it easy by any means and we got around 13L/100km for the entire road trip. That also includes daily driving up mountains

Sent from my IN2025 using Tapatalk

 

[BG1988]

GM can’t afford to lie about those figures, remember what happened to VW when they cheated on emissions testing? False results would cause a class action lawsuit of immense cost. Most people don’t drive like the EPA test cycle. But blame the EPA if you disagree with that. Carmakers do not determine the test conditions!

And of course some conservative drivers can beat the test loop results. However you’ll find them on different forums.

Beat the EPA cycle by 15.8MPG Yesterday..

35.8MPG mind you (speed i was going 55-83MPH based on traffic) I did have a cross wind, crosswinds are weird as they don't seem to effect the mpg negatively....


I did get gas at new gas station( made sure to top it off before the cycle to reset my gas tank, to that pump the day before...) so it would have minimal contamination.... I think it has something to do with the 0w30 oil i used as AFM is working more often then usual... at lest compared to the 5w30 i was using before (WAY less startup noise too.).(I still wait for the engine to warm up in M4 though. before letting it AFM.)

 

[steve45]

Ethanol in the gasoline will measurably reduce fuel mileage.

That said, you might have the dealer run diagnostics on it. I had three '95 Luminas as company vehicles. I drove them a lot, about 60K per year. I filled them up every day, drove the same routes, etc. I calculated the gas mileage every time I filled up. First car averaged 29.5 MPG every time, =/- about .3 MPG. Second car did the exact same thing. Third car averaged 21-22 MPG. I took it to the dealer and complained. They asked me why I thought it should get 29.5 and I explained that I filled up daily, drove the same routes, and kept daily records for two identical vehicles. They didn't have an answer. They ran the diagnostics and 're-tuned' it. Next time out, it got 29.5! I figured I should have asked for more...