I remember in my racing days, there was a night and day difference between a flashy 17" rim VS 15" Rota Slipstreams (which are very cheap for their weight). Going from the 17"s to the 15"s felt like power equal to that of swapping out the cams! Going back to the 17"s, sluggish... horribly sluggish.
With that in mind, if you have a lot of city driving, they can definitely help. Stopping and going constantly, it's going to definitely get you to your designated speed sooner w/ the same amount of throttle. I still use the Rotas to this day. The car has a great amount of pep and my MPG numbers are decent (though I'd like to see them go higher! Who wouldn't?)
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