I made the trip down over 2 days in my 03 Jetta ALH - no cat, no muffler, no EGR, stage 1, skid plate, 17" rims. Full tank of Loblaws D2 to Casey, IL netted me 50.5MPG. Route 66's B11 blend netted me 47MPG to somewhere in Oklahoma. The current tank is B5 from a Valero.
Average speed was...