hhahaa, wow. Thats...good. but you can probably do better..
I averaged 33.5 on a 400 mile trip WI-IN going about an avg highway speed of 75 and actually included getting stuck in traffic for 3 hours
On the way back..for 400 miles...I did about 30 spurts of 75-100 on I-65 for the 100 miles between Lafayette and I-80, then got stuck in rush hour traffic in downtown chicago on I-290 for about 2 hours, then drove around the north chicago suburbs in heavy traffic, AND being lead footed...for about 30 miles. I averaged 28.5 mpg for that 400 miles.
Me thinks something is holding you back, because my mileage is an L27 with 3.06 gears...