What are the stock wheel/rim size on my taco. 205x75x15 are on it but wanta go a bit bigger. How big of a tire will fit on the stock wheel without killing power and mileage? I was wanting to go 235x75x15 but someone on here said that may be too big for a 4 cyl. But are they? This might have been answered somewhere but I have searched and it's easier just to ask.