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