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Hiya,
So far, driving without my rear underpan has gotten better FE! At almost halfway through the next tank, the SGII is sitting at almost 50mpg, which is the best FE that I have ever seen. This is up about 2-3mpg over the most recent tanks with the underpan.
I guess the lesson is, you do really need to worry about parachuting -- and by putting an underpan in the front of the car first, and work your way back; working to exclude air flow from getting on the "wrong" side of the mod...
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