Looks like we got a competition going
At least in my mind. My last tank shot me ahead of your average, I don't expect the next tank to do as well because it is supposed to get bitter cold here this week.
I'm definatly interested in how the partial under tray works out....and the rear wheel well covers. COZX2 credits his Grill Block and rear fender skirts to a 11mpg improvement. Although I think he is assuming some engine on coasting benefit from the aero mods. So I don't think we will see this type of benefit. He also did two under trays. One under the bumper and the second extending to the back of the motor. He used a plastic sheet from home depot. The type the use on bathroom walls. He claims the extending it any further had a negative effect on the wake pressure behind the car. He also used 4 tire spats and had his lip spoiler to within 2" of the ground.