Senior Member
I would say the better idea would be to spend the money on engine mods too. I think you could improve your gas more by exhaust, injectors,TB, etc than a tire swap.
Member
Quote:
I would not go down to 215s, 235 or 225 in a street tread is where you want to be, as mentioned is it the tread pattern that catches wind, and a wider tire will do the same thingOriginally Posted by askingxforxit
I'm running 235/75/15 cuz that's what came on it when I bought the xj. Right now I get about 20mpg mostly highway driving. I'm curious what increase I would get going to stock 215/75/15.
a 235/75/r15 is 28.88" high x 9.25" wide.
a 215/75/r15 is 27.7" high x 8.46" wide.
find a 225/75/r15 street tread and go with it.
CF Veteran
Quote:
a 235/75/r15 is 28.88" high x 9.25" wide.
a 215/75/r15 is 27.7" high x 8.46" wide.
find a 225/75/r15 street tread and go with it.
x2Originally Posted by ChileRedBateman
I would not go down to 215s, 235 or 225 in a street tread is where you want to be, as mentioned is it the tread pattern that catches wind, and a wider tire will do the same thinga 235/75/r15 is 28.88" high x 9.25" wide.
a 215/75/r15 is 27.7" high x 8.46" wide.
find a 225/75/r15 street tread and go with it.
CF Veteran
Quote:
Any mod to increase fuel economy would increase it "to a certain extent"Originally Posted by jcwclm
To a certain extent.
Larger tire = more mass = engine has to work harder to turn it = decrease in fuel economy.