Gas mileage

[MoPartinez]

Wanted to see what other guys with a similar setup are getting mileage wise. I'm getting 12.9 mpg around town with a 2021 Bighorn 5.7, 3:21 rear end, two wheel drive. It's got less than 60k miles on it.
Only modifications are taller LT tires (275/65/20) and a so-called "performance" muffler. Stock suspension. I driver pretty mellow but I get on it to pass people or get on freeway on ramps.
Haven't done too much highway driving to gauge it properly.
Also, had a 2016 Big Horn that had the identical drivetrain and modifications and it got 15-16 mpg around town and 18 highway.

 

[vincentw56]

Wanted to see what other guys with a similar setup are getting mileage wise. I'm getting 12.9 mpg around town with a 2021 Bighorn 5.7, 3:21 rear end, two wheel drive. It's got less than 60k miles on it.
Only modifications are taller LT tires (275/65/20) and a so-called "performance" muffler. Stock suspension. I driver pretty mellow but I get on it to pass people or get on freeway on ramps.
Haven't done too much highway driving to gauge it properly.
Also, had a 2016 Big Horn that had the identical drivetrain and modifications and it got 15-16 mpg around town and 18 highway.

Did you recalibrate for the tires? I have a 2020 BH 4WD with 3.92 gears and I get much better gas mileage. Around 15 to 16. I've hit 19 on long interstate drives. I'm on the stock size passenger tires.

 

[SD Rebel]

34" tires seems to be your answer, I've never owned a truck with 33 or larger than didn't get 13 mpg or less.

However, you stated you had a 2016 with similar size tires? If so, I guess for you maybe it's in the axle ratios, or weight difference as the DT is heavier than the DS.

 

[ikreider]

15-16 around town, close to 19 on highway
2021 limited 5.7 3:21 stock tires

 

[TedN]

I'm getting 17.5 around "town"..... granted that's a rural town, but still some stop and go. On the long rural roads (basically 65 mph for 40 miles, slightly hilly), I have averaged 21 mpg. This is checking manually, a little less than showing on the dash (that's 18/23). I feel good.... that's running 295/65-20's(35") with a 3.21 rear end, 4x4. 5.7 e-torque.

 

[Richard320]

Sounds right. I've got 4WD but otherwise the same setup and 56,000 miles and if all I do is city streets, I see 13-15. Sitting at stop lights just destroys fuel economy.

 

[whippster]

I have a 2022 Bighorn 5.7 (no E Torque) upgraded Waldoch package, 6" lift, 35x12.50r20 custom wheels and performance exhaust and I'm getting 14-15 around town and 17-18 highway.

 

[1923bob]

I have a 2022 Bighorn 5.7 (no E Torque) upgraded Waldoch package, 6" lift, 35x12.50r20 custom wheels and performance exhaust and I'm getting 14-15 around town and 17-18 highway.

Welcome to the forum.

 

[whippster]

Welcome to the forum.

Thanks!

 

[Ready Go]

I was getting 20mpg stock (5.7, 3.92 posi), but always trying for more, then Wifey-pooh said "turn that guage off"..now I enjoy my truck SO much more