Well, I think I'm getting the hang of this car after 3 months. My mileage has been steadily increasing as the weather has gotten warmer and as I've adjusted my driving a bit. If I drive fairly normally i get about 55 mpg (HSI, ~52 mpg actual). If I'm more careful I get closer to 60 mpg HSI. If I'm really careful I get over 60. My last tank was 61.8 (HSI), and 59.6 mpg from the fillup (see attached). I put 10.13 gallons in the car for 604 miles. I call that 60 mpg, and I'm pretty pleased. This is for a week of normal commuting which includes lots of hills, about 1/3 surface streets, 1/3 state highway, and 1/3 interstates with occasional stop-and-go. It is pretty hot here these days so the AC runs constantly. I have only seen my mileage get better with time so I haven't seen it roll over as the weather has gotten really hot, but that may be that any affect is counteracted by my learning to drive this car. The car has the larger mudflaps front and rear, AC always on, and it is quite hot and humid here. None of this seems to have much affect. If it does then it will take some very careful analysis to figure it out. Things that I've found that do make a big difference is accelerating hard, using the friction brakes (obviously), and short trips. That warm-up cycle is deadly and it really kills my mileage for the first couple of miles of a trip. All of this is stuff you-all already know. I'm just pointing out that it is penetrating my thick head. Thanks all!