I can manage around 18-19mpg with the Looney, it does provide really good mileage, as long as you can keep your foot out of it. I managed to do that on my trip from upstate NY down to the FL keys at the begining of march. A couple times I had to show up a dodge or Chevy owner, and one time when I had to follow a Ferrari as long as possible until he pulled away at 120mph, I wasn't willing to stay at 115mph for very long. Anyways back to MPG with the looney, I did get very nice mileage both ways, and one tank of LSD did net me 570miles or that's what my math told me. But I do have to say that with the prices around here, it's just not wise to take long trips, I almost want to drive my offroad truck just so I don't have to pay for the fuel, but I only get about 13mpg city with that thing, whereas I get about 14-15 with my PSD, I guess all we can do is hope for the price to come down soon.