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Must say that I am puzzled why you suggest that the Mirage is a 40-50 car.
I am averaging 62 mpg (US) with only very mild hypermiling.
One suggestion I would make is to run steel wheels with 165 tyres as this is worth 5% in the official European economy tests. My car has these as standard.
The difference in yearly fuel cost between a car doing 60 mpg and one doing 70 mpg must be quite small with US gas prices.
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