I believe there is a company that has an ECO TUNE for diesels. it gives you a bit of a power boost to but it's geared towards Economy. I don't remember off the top of my head which Company it is..
You are saying you are interested in Aerodynamics. Do you have any reason for not lowering the vehicle a few inches?
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(No actual EPA numbers for car just used F/E numbers when i first got it)
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