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Thanks kir_kenix. Yes I am aware of this. In fact I have beat the mpg projections in the middle parts of the curve but matched both ends to my real world data. I pulled my dealer city/hwy/mixed mpg sticker projection off the graph. My truck naked is rated at Hwy/21 mpg and this happens at around 62 mph. With the aerolid I can get 21 mpg at 67 mph. With the boat tail this happens at 72 mph. I think the calculator and my graph help visualize the improved performance. Both Phil and I think improvements could be made to the calculator, but are impressed that it fit my data pretty well.
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