llm.flyfisher
Well-Known Member
- First Name
- Keith
- Joined
- Nov 27, 2019
- Threads
- 3
- Messages
- 78
- Reaction score
- 99
- Location
- Corpus Christi TX
- Vehicle(s)
- 2019 Range crew cab XLT
Actually a heavier tire does absolutely affect mileage negatively. I have gone to 37s on my 2006 dodge cummins and seen the mileage drop from around 14 mpg to under 10 mpg. Of course this came with a full Carli 3" suspension as well. Then dropped back to 35s, and then back to 275-60-17s. Mileage came right back to just a little over 14 mpg. I was running the same BBi Stage 1 injectors and twin Garrett ball bearing water cooled turbos with tow tune so all this stayed exactly the same. Heavy bigger tires kill fuel mileage due to much greater rolling resistance. No getting around physics.
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