This may have already been discussed, but I am curious what you guys think the best highway speed is for gas mileage. My guess is that it would be around the speed when your car shifts into the highest gear. Do RPM's vary directly with fuel consumption? i.e. If running 2k rpm uses 2 gal. an hour, would running 4k rpm use 4 gal. an hour?

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'98 C280

Birmingham, AL