Well, that's mad annoying...I'll just have to look into commonly fuel-sapping problems, since there's obviously something wrong.
Increasing Gas Mileage With Taller Tires? - 6G Celicas Forums
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215 is totally fine, and probably a better choice than 205. You can go up to 225 I believe w/out any concern of rubbing, and I don't believe either one will affect mileage. I'm running 215/40R17 on a manual ST and get 30 mpg on average, that's with stop and go and highway combined.
QUOTE (joyworks @ Oct 24, 2008 - 4:07 PM) 
>Well said 97GTinKC, those are my feelings on the subject as well. Now, can anyone tell me how large of a wheel/tire diameter I can safely get into the wheel well of my Celica without any rubbing? It has not been lowered. I assume it would dependent on tire width. I will probably go with a 205 or 215 on a 16" rim. Any wider, and like people said earlier, it will negate any fuel savings.
215 is totally fine, and probably a better choice than 205. You can go up to 225 I believe w/out any concern of rubbing, and I don't believe either one will affect mileage. I'm running 215/40R17 on a manual ST and get 30 mpg on average, that's with stop and go and highway combined.