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I think spike-tyres = what we call "studded snow tires" here in the U.S.?
Studs or spikes will definitely reduce fuel economy. I can't tell you if your car is running properly or not but I'd expect an improvement of maybe 20% when you switch to regular tires (or tyres!).
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Coast long and prosper.
Driving '00 Honda Insight, acquired Feb 2016.
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