ultraclyde wrote: Last time I checked mileage during an autocross on my Mustang was in 08 or so. It got around 11 while on track. Not long after I checked the wife's R53 during an autocross. It was getting around 9.
My RX-7 burns 5-8 gallons of fuel per rallycross, mostly from idling in grid. I don't like to think about what that equates to MPG-wise.
I once drove my '11 Fiesta 425 miles at average speed of 60mph, averaged 40 mpg.
Usually get 36-37 DD.
My ZX2SR would get 8-10 on track day.
Will see what the Fiesta does in May.
PO normally got 35mpg highway, and I was seeing ~42mpg highway. The difference was that I exclusively fed it 92-93 octane and he didn't.
The cool deal is you ACTUALLY stayed ahead of the cost on premium. The car had to get ~39mpg just to break even on premium, but since you were getting 42 you did actually save money. 
That's why it lived a diet of the good stuff. And why I always preach to people, just TRY it for a couple of tanks, and do the cents per mile breakdown.
When I had that car, gasoline was $4.19/4.34/4.49 for 87/89/92.
Current car makes no difference between 87 and 92 (no more 93 here) so I went the other way and started dumping cetane enhancer in the tank. Fuel economy did improve (as did part-throttle acceleration) but it was not even enough to offset the expense of the cetane enhancer. Other people have reported good success with it, though.
ProDarwin wrote:confuZion3 wrote: My Miata gets about 30 MPG all the time on the street no matter how I drive it. I've never seen it dip below 15 on the track.What the berkeley kind of bizzaro alien Miata do you have?! Do you only drive downhill? I've seen 30mpg maybe once in my NB, never in the NA.
My commute is downhill. Both ways. 
Also, I don't have any 65 MPH speed limit zones around me, and I couldn't exceed 55 even if I wanted to because of traffic. Keep it at 55 and it'll get there. Thanks to its advanced aerodynamic profile, anything higher than 55 absolutely kills fuel mileage.
HappyAndy wrote: I'd be curious to hear what, our now multiple, Fiat 500 Abarth owners have to say on this subject.
I don't think my sister has seen anything less than 40 in her Abarth. I guess you can only burn so much fuel with that tiny engine.
On the other hand, I remember babying my old Mustang GT on the highway back in the day and being able to watch the fuel gauge move. I don't think I ever exceeded 19 mpg in that car, and believe me, I've tried!
8.5 for the Cobalt SS on track days at Hallett. 31 cruising over and back on the freeway, 72-3 mph.
My Volt does well in this area. It's amazing how much more often you can use the throttle when flooring it is silent. The answer is complicated, I'm sure, but I'm doing about 65mpg lifetime. On an 80 mile round trip, you'd probably get 35-40mpg for the last 40-60 miles, and the rest would be electricity.
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