Anybody who’s been following the US election news recently will have heard about McCain’s mocking of an answer Obama gave to a question in one of his campaign stops about saving fuel. Then he half-retracted it.

The truth of the discussion is that ensuring your tires (or tyres, for those English speakers outside the US) are correctly inflated does indeed help to maintain the efficiency. Having a handy little pressure gauge in your glove box and using it regularly will help keep your car running efficiently.

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