I have a '96 Tacoma Reg Cab which came with 225/75/15 and 3.58 gears per the door plate code. It is a 4cly and 5 speed truck. I have been running 235/75/15 Hankook MT's and no real complaints on power. I am thinking about new tires and thinking about the same tire in 30x9.50x15. The specs indicate this tire to be .70 inches taller. Per the specs, it is a difference of 17 revolutions per mile. I am wondering if anyone knows or has experience on how much power difference this will make. Will it be a noticeable rob of power or should I stick with the 235's. Thanks.