Looks like you're going to hit your 40mpg goal.
If you're pulsing between 70 and 55, I expect your average speed is doing to be a bit less than halfway between the two (due to non-linear decelaration), somewhere around 60mph. I wonder what your fuel economy would be when cruising at a steady 60mph?
Don't get me wrong, pulse and glides can help even with the engine on, but reducing speed has a tremendous impact on fuel consumption too.
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