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Disclaimer, I know very little.
Based on your sig, the car has an automatic transmission, so if it gets in the top gear at 45, then it should be noticeably more efficient than the same gear at 55...lower rpms, less wind resistance to fight, less friction in the tire-road and wheel-axle interfaces.
My question is, would it be more efficient to start at 45, accelerate up to like 60, go into neutral (I don't know if that's kosher on his transmission but pretend it is), and do the whole pulse and glide shindig? And if that might be more efficient, would it be better to do very light acceleration trying to keep it in top gear, or would it be better to accelerate more moderately quickly?
Obviously the best way to find out if 45 will be better for you (in terms of spending time versus saving fuel, how much? etc.) is to try it.
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