My stock tire size is 195/70 14 ~ 24.75 inch diameter. I was considering moving up to 205/75 14 ~ 26.1 inch diameter or 215/70 14 ~ 25.9. This would, in essence, give me the effect of an overall higher read end ratio. It feels as if the engine is revving more than it should at 65 - 70mph. Is this advisable? Also, what should the expected mile-per-gallon be for this year/model assuming everything is running correctly, and a conservative driving style? Thx, Bill