sohl -
Welcome to EM! While I have *no* proof, my impression of Mazda is that it markets itself as the "performance" Japanese car company (zoom zoom like you are saying). It doesn't mean it's *the* best Japanese performance car company, it just means that it has catered to the USA HP over MPG market (until recently).
If you have bigger tires, I would suggest a GPS/odometer comparison. It may be that your tires are making your odometer read fewer miles than you are actually driving.
CarloSW2
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