[mike93082]

I am rebuilding my 1ZZFe on my 99 Corolla. I am most likely going to have the cylinders bored .10 over. What I dont know is how will this affect gas mileage. I already highly doubt it will give any difference in power but I am unsure about gas mileage.

 

[toyomoho]

MPG might increase assuming the compression is back to normal.

 

[Flashmn]

Well hard to say, you do realize you are making the cylinders bigger. But then again if you have alot of blowby... then...