Quote:
Originally Posted by kam327
But why are you expecting a 3mpg gain from the shutters if the EPA rating is only 2 mpg higher, and that's with the use of lower rolling resistance tires and aero wheel covers? So if the combination of the shutters and wheels/tires gives you a 2mpg gain, I don't think you can expect more than 1mpg from the shutters alone.
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If my car would get anywhere NEAR the EPA rating with the shutters I'd be interested. It seems no matter what, the BEST I've ever gotten, ALL highway, was 34mpg. NEVER have I gotten a tank to average more than that, even though my EPA rating is supposed to be 38 hwy. So... if my car was EPA tested WITH the shutters and I end up at 34 on AVERAGE instead of the 29-30 I get now, I'd be pleased.
Besides, how do you know it's only going to net 1mpg? Have you done the conversion yourself? I would like to think that the design behind them is capable of more than 1mpg gains over not having them, otherwise there wouldn't be much of a reason to invest in their development and implementation.