- First Name
- DakotaTimber
- Joined
- Nov 19, 2020
- Threads
- 2
- Messages
- 181
- Reaction score
- 162
- Location
- North Dakota
- Vehicle(s)
- BS BL + BL, 360+, tow +
Wow, I have 1800 miles on my OB, and my dash mileage has never gotten over 21.9. Briefly went to 22, but went back.
I did put 235/65/ 18’s on it and they are slightly bigger, but wouldn’t think it would make that big of a differenc.
Your tires are about 5% larger, so that's a 5% decrease in mpg with all other factors remaining the same . I don't know the weight, but heavier tires = worse mileage. Bigger contact patch worse mileage. Figuring a square contact patch( which is doubtful ) you went from 79.21 square inches to 86.49 square inches...that's a 10% decrease in mpg. Lower inflation psi poorer mileage, bigger contact patch. Higher inflation, smaller contact patch, better mileage. Adding all that up and you decreased your mileage by 15% on the dash computer without factoring in weight. Getting the odometer adjust to 672 revs per mile should bring the computer mileage back up 5%, but the rest you have to blame on the tires. The good news is, you should have better braking, although you will wear the pads out faster. You should also have better off road performance.
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