I've seen VW beetle people call this a "rubber overdrive". But I suspect they're resizing all four wheels.
The increased rotating mass of the bigger tire will be negative for city stop and go driving - due to you have to accelerate that mass all the time. On the highway the increased rotating mass doesn't hurt you nearly as much.
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Coast long and prosper.
Driving '00 Honda Insight, acquired Feb 2016.
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