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In my car a higher load like 80% in 5th gear at a very low RPM yields better MPG than a lower load like 65% at a higher RPM in 4th gear. Basically you want to be in the highest gear possible always. Lower RPM is better at the same speed. Don't let you speed drop too much. If you do so, you have to apply higher loads downhill to gain back speed. I only let my speed drop 5-7 mph going up a hill on the highway. So for example I target 60 mph on the highway. Up a hill I pick a load that slowly lowers my speed from 60 to 55 by the time I reach the top. At the top I can reduce the load and slowly add speed on the way down until my next hill. On flat ground I maintain 60 mph.
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