One from experience - if you have boosted your tire pressure to eke out a bit more FE, and you take your car to a dealer (perhaps elsewhere as well) for an oil change, remember to ask them NOT to decrease the tire pressure to the "recommended" level. I just picked up my FEH from the dealer, after its first oil change, only to discover that setting the tire pressure (in my case, letting out the extra air I just paid for the other day!) is part of the routine; now I have to go back and pump them up to 40 PSI again.

Thought I'd try to save someone else from the same hassle.