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Best C5 Gas mileage

3641 Views 8 Replies 7 Participants Last post by  cor66vette
I'm about to take a 750 or so mile trip with an '03 6-speed all on Interstate. What is the best cruising speed for mileage and the best for the engine?
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Although mine is a C6, it is also a 6-speed and when on a trip I set the cruise control at about the speed limit +5 and routinely get between 30 and 30.5 mpg. On many trips I have gotten over 31 mpg.
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