Last fuel up, I got only 11 mpg, before that 25mpg. Same station, Octane is 91 as I have Turbo. No CEL lights. Thought I might have accidentally hit the trip when dusting, but, same thing next fuel up. 11 mpg. Tire's are filled with Nitro, so should not have issues with pressure. I do not smell gas or see anywhere on garage floor where there may be a leak. The only thing different that I HAVE noticed is when I start it up, it has a high 'whirring' sound, like a plane engine almost, just not as loud.