2014+ Gas Mileage (MPG) Topic

Justin MacGillivray · June 17, 2015

Was averaging 20 mpg on the highway cruising along at 80-95mph last night. And my calculations have it about .3 off. I haven't taken it on a really long flat trip yet. But setting cruise control, I notice improves mpg's dramatically over my right foot.

My mom's Impreza is off by 3mpg. It's reading 28-29 and getting 25-26.

bboyce536 · June 18, 2015

I used the same station and pump and method 80% of the time. Still off, I blame Dic. ☺

Remember most stations have only 1 STP (submersible turbine pump) per grade. So depending on volume being pumped while you're pumping can change flow rate. Usually it won't change by much but it will vary. You can check both...even I do, but taken it with a grain of salt. It will vary.

mjj · June 19, 2015

Was averaging 20 mpg on the highway cruising along at 80-95mph last night. And my calculations have it about .3 off. I haven't taken it on a really long flat trip yet. But setting cruise control, I notice improves mpg's dramatically over my right foot.

My mom's Impreza is off by 3mpg. It's reading 28-29 and getting 25-26.

Wow that's crusing right along.

Don't tell me that. I've never took the time to hand calc my Legacy but it said I got 32.5 over a 500 mile round trip recenty. I thought that was darn good. Still prefer my Silverado burning thru E85 though.

SkiDooNick700 · June 23, 2015

Very, very satisfied with the MPG of my 6.2L. My daily commute is thru a few small cities/suburbs. Basically there is a stop light every mile, and then also there are 1/2 mile lights and sometimes even 1/4 mile lights :-(

Anyway, I got 2 weeks ago I got 16.4MPG and then last week I got 16.2MPG. That's about over a ~140 total weekly trip. The DIC seems to consistently read .5MPG, so at least I can pretty well guess what I am actually getting. I am very satisfied with 16mpg+ for this truck. Coming from my porky 5.3L avvy that around 13 or so city, this is GREAT!

I got 19.3MPG on a highway commute averaging 75MPH with A/C on, that was with about 300 miles on the truck, and I rolled into the throttle several times on the highway to put some load on the engine. I bet I can probably get 20, but am not expecting much higher than that unless I force myself to do like 70 or 72.

tnchevy · June 23, 2015

The tires also play a huge role in mpg on trucks. The stock tires are very light and "AT" tires are really no more than street tires. Put on an LT AT tire and you going to lose 10% at least on your gas mileage. I don't do much off roading in my personal truck but I love the look of an AT tire where the tread goes all the way out and doesn't cup in the stockers. I am going to keep my goodyear oem's on mine till they wear out though, too tight to buy a new set of tires just for the look.

Edited June 23, 2015 by tnchevy

Rawyzf · June 23, 2015

The tires also play a huge role in mpg on trucks. The stock tires are very light and "AT" tires are really no more than street tires. Put on an LT AT tire and you going to lose 10% at least on your gas mileage. I don't do much off roading in my personal truck but I love the look of an AT tire where the tread goes all the way out and doesn't cup in the stockers. I am going to keep my goodyear oem's on mine till they wear out though, too tight to buy a new set of tires just for the look.

I couldn't stand the goodyears sra, so I took them off before I even had 150 miles on my truck. However, I do wonder once and a while what the MPG difference would be between those and the Cooper ATPs I have on there now.

Again, though, I am not complaining. I knew going to a true AT tire would effect MPG.

SkiDooNick700 · June 24, 2015

The tires also play a huge role in mpg on trucks. The stock tires are very light and "AT" tires are really no more than street tires. Put on an LT AT tire and you going to lose 10% at least on your gas mileage. I don't do much off roading in my personal truck but I love the look of an AT tire where the tread goes all the way out and doesn't cup in the stockers. I am going to keep my goodyear oem's on mine till they wear out though, too tight to buy a new set of tires just for the look.

Man I hear ya on that. I really want some BFG's AT's again, had them on my last truck. At the end of the day, this truck was really expensive and I just need to drive it as is for about a year or so as I refund my money specifically for truck mods. I must admit, I really am enjoying the economy with everything stock, as well as the quietness... Coming from a truck with Flowmaster 40, kn cai, level, BB Tune,,, I'm 23 years old, what's happening to me...

tnchevy · June 24, 2015

I am pushing 40 but have had a full size chevy truck with some type of flowmaster on it since I was 23. I thought this truck was too quiet so I tried out the Dynomax VT but it just was not the sound I was after. I am starting to like my quiet truck now but still not overly impressed with the gas mileage when comparing it to my old truck or my f150 work truck.

robvas · June 26, 2015

Highway mileage, 70-74mph, AC on, 33" BFG KO2, speedo uncorrected

Rocon · June 30, 2015

Just drove from Virginia to Connecticut today with three people, cruise set at 75 with A/C on. 2014 GMC SLT Crew cab 5.3 with 49,000 miles. In 455miles my avg was 22.3 MPG. On the way down to Virginia I only got 17 mpg was carrying furniture that stuck over the cab 18" high x 48" wide.

Victor Ferreira · June 30, 2015

Averaged 20mpg up from south Florida to Atlanta with 4 adults, a dog and luggage. I'm pretty happy.

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Rawyzf · June 30, 2015

I'm trying my first tank of nonoxy 91 to see how that goes.

brwk · July 1, 2015

Round trip from MD to TN and got 23.2mpg averaged 70mph w AC on and my wife sleeping next to me I'm happy.

Edited July 1, 2015 by brwk

Tyler Roy · July 1, 2015

First 300 miles in my 5.3 with city and highway and i'm currently at 22.

bboyce536 · July 2, 2015

Lifetime over 2100 miles on my 2015 6.2 4x4 is 18.4. I have a 2 mile drive to work otherwise I would bet my lifetime would be over 20 if it were actually able to warm up.