Well, I have a near standard FD and get around 13mpg. I put in about £500 (or $931) per month. But then, I do have to pay $1.58 per litre!! Damn UK tax is a bitch!!

 

Good thing I have a daily driver besides my 7. My MPG in my 7 right now...fully blown with a T78 is about 8-10 in the city untuned. My camry is about 24MPG in the city and even better on the highway. But get this...ON THE HIGHWAY = 20MPG for the fd. Great gas mileage!!!
Craig