I can't figure it out, since last week I have been using close to a third more fuel than i normally would, i'm not in 4x4 or driving any different, and my digital mpg reading is the same as well. But i can't smell gas anywhere so It's not leaking i don't think. Any ideas? 9.7 mpg was bad enough, now I'm getting around 10 so says the readout, but my tank says other wise. Please help.