Increasing Gas Mileage With Taller Tires? Options

[joyworks]

One of the few things that I dislike about my '99 Celica Convertible is that the gas mileage isn't as good as it could be. The 1997-2001 Camry, which had the same engine, got 3 mpg better on the highway with a 5-speed than my Celica does with a 5-speed, and the Camry weighed about 300 lbs more! I can only attribute this to the high revs of my Celica's 5th gear. So, my question is, can I achieve better fuel economy with a larger diameter wheel/tire combination? I know it would throw my speedometer off a bit, but to save fuel, it would be worth it to me. On that same note, what would would the tallest tire that I could put on a 16" rim and not suffer from any fender rubbing? What about a 17" rim? Thanks for your help!

[samir0189]

Ill have to agree with playr, tune it up. The 5sfe is easily capable of 32+mpg hwy. Plugs, wires, correct timing, proper tire inflation, and a light foot with conservative shifting points (2500 rpms) will get you great mpg.

[joyworks]

Actually, I already do all of those things. I am currently averaging 32-33 mpg in 85% highway driving. I am just wondering if I can do even better with a taller tire, as I am planning on getting rid of my old stock rims for 16" or 17" new ones.