What's your mileage on the track?
 

Our cars are capable of more than 30 mpg on the highway. I would like to know what kind of mileage you are seeing on the track. Of course this will vary with your setup and the track you ran, so please give some details. This may also be one method for assessing the health of your car, and also the effect of any new mods. It would help if you use the same format as below. Here's mine:

Mileage: 9.5 mpg
Model: 2013 FR-S
Engine Mods: Cosworth drop in filter, Perrin Inlet Tube
Tires: BF Goodrich Rival 225/45/17
Track: Brainerd International Raceway Competition Road Course
Fuel: BP 92 octane + 2 oz. per gallon of Race Gas
Other: Includes about 10 highway miles to and from the motel, 105 miles total

We get around 3-4, depending on the track.

Stock drivetrain
Tein SRC coilovers
Tires vary (RS3, RC1, Rivals, Star Spec, stock)

I'd file it under "doesn't matter"

I reset my fuel consumption just before I went on track..... 7.7mpg....

I get about 5-6 including trips in town to/from the gas station, hotel, etc.