Boss gas milage info
- Thread starter tblt44
- Start date
5.3 10spd. I avg 18mpg but mostly freeway
bossboy302
Member
3.0 Duramax 10spd=25.8 mpg
Total average over 1937 miles incl. 650 miles towing 7500 lbs.
Total average over 1937 miles incl. 650 miles towing 7500 lbs.
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Depending on where you live, diesel can be about 35% more expensive so that takes away some of the excitement for me.
I still wish I had one though
I still wish I had one though
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bossboy302
Member
Remarkaby, in good ol' NorCal diesel has dropped. Available around $5.49 which slots in around mid-grade gas.
Coachsimmons85
New member
2023 durmax. First 150
Miles. 28 mpg
Miles. 28 mpg
Raychavez91
New member
2020 5.3 6 speed, with a 3.5” lift on top of stock, 35” tires, I get about 13mpg
Gearhead SS
Member
Best I ever got in my 6.2/10 spd was right at 21 on a long highway trip. Overall average for 21k miles was around 17mpg.
clstark7
Active member
When I bought my tuner for my 6.2 from Superchips, they had different dyno charts for the different setups. 5.3 with the 6-speed, 8-speed, and 10-speed. And of course the 6.2 which is strictly the 10-speed. But interestingly, the 5.3 with the 10-speed was putting more power to the ground than the other transmissions. And if you were able to compare window stickers, you will see that the 5.3 with the 10-speed also has better gas mileage. I would explore that option if you have the chance. But you won't be disappointed with the 6-speed either!
vezePilot
Well-known member
The 5.3 and 6-speed are working great for me. At elevations above 5,000 ft MSL, I get 18-19 around town, and 20-23 on the freeway. Best I ever got was 25 mpg going across Northern Arizona. More than enough HP to pull a big F-150 up steep inclines in deep snow.
Are you saying the 5.3 10spd had higher dyno numbers than the 6.2 10spd? Or the 5.3 10spd had higher numbers than the 5.3 with 8 or 6 spd?
22' w/ 6.2 & 10spd
Average driving, about 21-ish mpg
Highway road trip, hit my PB at 26.3 mpg (between 55-65 mph)
I'm also using 93oct, else 91oct when nothing better is available. I'm WFH, and a tank can last me a month at times.
Average driving, about 21-ish mpg
Highway road trip, hit my PB at 26.3 mpg (between 55-65 mph)
I'm also using 93oct, else 91oct when nothing better is available. I'm WFH, and a tank can last me a month at times.
clstark7
Active member
No, sorry for the confusion. The 6.2 had the most. The 5.3 with the 10-speed had more than the 5.3 with other transmissions.
Reason being......(drum roll please).....a much closer 1:1 engine-trans match for whp/wtq readings.
However, most advertise as flywheel hp/tq numbers. Still gotta factor in the parasitic loss.
clstark7
Active member
Good points. But Superchips claims that these are vehicles on dynos, so it's supposedly wheel horsepower. I'm sure the power gains are under perfect scenarios and after 20 runs, you know how that goes with power adding claims lol.
