165/70 R14 VS 175/70 R14 (for gearing/fuel ecomony)
I'm thinking of changing the stock tires (165/70 R14) to 175/70 R14. This would result in a larger diameter and should reduce the rpm at highway speed (better fuel economy), however the wider tire will create more air and rolling resistance and should reduce fuel economy.
What will the final result regarding fuel economy be?
TIA
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View my fuel log 2016 Micra Active manual: 6.0 L/100 km ... 46.9 mpg (Imp) ... 16.6 km/L ... 39.0 mpg (US) ...