Bad gas mileage(for an 8) What steps can I take?
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If you were to remove all drivetrain drag, aero drag, etc... and were to measure the engine on an engine stand looking for what RPM is the most efficient, it will be at the point of peak torque (even if you aren't demanding 100% torque), which for the Renesis will be in the 5,000-5,500rpm range.
However, when you add in the other factors, 5,500rpm is far too fast, and the aero drag alone will crush the engine efficency difference between ~3,000rpm at 60mph and 5,000rpm at 100mph. (your S2 gearing will have a bit different speeds at those RPMs).
Lower gear to put your RPMs into the 5k range at 60mph isn't really viable either though, since the increased RPMs for the same speed will have increased drivetrain drag that will also overcome the difference.
If you were to remove all drivetrain drag, aero drag, etc... and were to measure the engine on an engine stand looking for what RPM is the most efficient, it will be at the point of peak torque (even if you aren't demanding 100% torque), which for the Renesis will be in the 5,000-5,500rpm range.
However, when you add in the other factors, 5,500rpm is far too fast, and the aero drag alone will crush the engine efficency difference between ~3,000rpm at 60mph and 5,000rpm at 100mph. (your S2 gearing will have a bit different speeds at those RPMs).
Lower gear to put your RPMs into the 5k range at 60mph isn't really viable either though, since the increased RPMs for the same speed will have increased drivetrain drag that will also overcome the difference.
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