Switching to E0 in the Subaru Forester has increased mileage from ~24 to ~26 mpg in city driving. In our Honda Civic it also increased from ~37-38 to ~39-40 mpg. I noticed it allows me to run lower rpm in every gear without lugging the engine.
The fuel consumption at the same rpm may be the same, but the engine on average turns less often for every mile I drive.
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