FE? Not sure if it effected mileage that much. Certainly makes no difference around town. Currently has a 28 gauge steel center section to deal with heat. I found the light gauge aluminum to be too noisy. The side sections are 3/16" solid poly that went wavy the first time it got hot. I no longer drive this car on lengthy trips. Making the bellypan more trouble than its worth.
My wife had complications from our first childbirth which required the purchase of something more comfortable. The suburban became our daily driver when our 3rd child was born. So this car has turned into a errand car making only short trips. I had my fun with it. Twice averaged well over 50mpg on 3000 mile vacations crammed with stuff. I'm thinking of auto crossing it now.
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