Quote:
Originally Posted by Nick M3
A couple MPG and slower acceleration is either your ass dyno, a change in diameter (if they are meaningfully bigger, you’ll record less distance traveled, and have the car geared up higher), or something coincidentally went wrong on the car.
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This. Either some slight thing, perhaps you had really old tires which made more noise & vibration adding to perception of speed. More likely, if you are observing a definite effect, then something is going wrong. Assuming you got the same size of course.