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Originally Posted by 2win2rbo
I was using 3% oversize tyres on 15" rims before and was getting good MPG but Auckland has a really wet winter.
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The 15" are likely your best compromise between handling and fuel economy.
If you're going all-out for FE, chose the narrowest tyre you can fit.
Do you get any snow down there in winter ?
If you do, I'd go for the 14" wheels in winter.
If you don't , chose a low rolling resistance tyre that you can drive all year long.
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I know Bridgestone Ecopias have 215/45R17 tyres but do they really aid in MPG gains?
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They didn't in the ADAC.de testing - in 185/65 R 15 H , tyre performance can change a lot with different sizes though.
I do wonder though why you went for wider tyres in winter.
Narrow tyres perform better in snow and rain, whereas the bigger ones just add drag and tend to float.
(I've been suffering up to double the normal dry fuel consumption while driving in a downpour last week. Rain kills your FE.)