I'd say the biggest thing that people who aren't into hypermiling or modding for FE don't understand (or tolerate...) when speaking about gains is any time the car is either out of gear or moving with the engine off.
Leave it in gear, leave the engine running, prove mileage gains based on physical changes to the car alone (aero or mechanical)... then you'll have some believers.
I told a few friends about the HAI when I first did it and they were like, "Wait, you drove it normally. You didn't ever coast in neutral or cut the engine off and you got 43mpg... just from that HAI thing? DAMN! What's that car rated to get?" I told them 31 highway and one said, "can you help me build one for my car?" lol
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 John
'09 Saturn Aura 2.4L
'94 Chevy Camaro Z28 (5.7L 6sp)
'96 Chevy C1500 (5.0L 5sp)
'08 Kawasaki Vulcan 900 Custom
'01 KTM Duke 2
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