I get far worse gas mileage when I am in sport mode. I did a comparison by driving in normal mode for a full tank and then a full tank in sport mode. The difference was pretty big, but it was not a fair test. For some reason whenever I push the sport button I push the gas pedal more. LOTS MORE!! I tried a couple other times, but I keep having the same problem. Whenever I'm in sport mode I just like to feel the power that much more. I even attempted to compare manual to auto. Same problem. I just can't engage manual without the sport button....and you know where that leads meAnyone else getting better gas mileage in sport + manual?