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Concrete... unfortunately not all of us have the option to install a scan gauge on there car, unless you know of a way to install one one my 1985 1.6l vw diesel. (no ecm) So knowing what rpm your car is the most efficient is very necessary. For the best hypermiling drivers would try and stay in that sweet spot, or re gear there cars to hit that sweet spot at the speed the most often drive. For my car it is 1800 rpms. If I could set my car up to cruise at 60mph at 1800 rpms I would be getting the best fuel economy possible for that speed.
The BSFC charts is actually close to what I was talking about. What I'm used to seeing is g/kwh up the side and rpms along the bottom and a line graph showing how much fuel is consumed at each rpm. But I'm sure I could get that information out of the BSFC's if I learn how to read them. Thanks a lot for the suggestions.
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