the real usefulness of the dyno comes from knowing what rpm your car makes power, and how much power is made. that is stuff you don't really need because you can feel where your car makes power. another thing about a dyno is that all pulls are made in 3rd gear, and on the street, your car will rarely get to 3rd in a wot pull. almost all my pulls either start in 3 or 4 and then drop to 2 or start in 1 and shift to 2 at 45. the way my tune is set up I stay in 2nd gear all the way to 95.