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Old 09-14-2010, 12:57 AM   #1 (permalink)
Meph
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Join Date: Apr 2008
Location: ontario
Posts: 84

240Z - '73 Datsun 240Z 240Z
90 day: 34.41 mpg (US)
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Reducing Tire Width

What could one expect to gain reducing two tires on a car from 285/40 to 225/50, the larger tire being a soft 180 tread wear compound and the new tire being a 400+ LLR.

The car seems to do 35MPG on a good day so lets use that as a starting point. The newer tire would be 1-2% smaller that the original so hopefully the gain would outweigh the loss in diameter.


For kicks what would be your guess at a final MPG if I did the following

- New tires
- Alignment (currently pull a bit to the right and totally ate the inside tread of the front right tire in a couple thousand km's, Toe is off, and at least 3/16ths toe in
- Switching from dino to synthetic oil in the trans and diff, lightest weight possible.

Wanna see if I can hit 40mpg one day

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