Ive thought about going from my factory 245 wides to 235. But I was told that wider is better. I guess you can run the psi higher in a wider tire because the manufacturer expects it to shoulder more weight. Plus it distributes less weight per square inch.
http://ecomodder.com/forum/showthrea...mpg-17802.html
Originally I wanted thinner tires to kind of cut the air better. I thought the taper would help seeing how the wall would need to stretch out to meet the rim.