Engineers always have to put numbers to things so I did a little simple math and the improvements I reported amount to $0.71 for a 100 mile trip, or roughly $0.71 savings per hour of cruise flight at 5200 rpm and $4.00 per gallon clear Mogas. This is more than I expected. Imagine what the dollar savings are for the lift strut fairings, which most people claim to be about 10 mph improvement!