Wow i wish ours was close to that. When we first got it back on the road running pure 91 we would drive it to SD for the week ends and it would burn over a 1/2 tank in 180 esh mi of coarse 80% of that time it was running 80 mpg so some where around 20mpg. When i went to e30 mix i did not notice any millage loss at all and maybe a very slight increase. I have been running on e60 blend now for a few weeks with the bigger 660 injectors and its using more fuel but i have been running it fairly hard. It is definitly running strong i took it for test drive a few days ago on a long uphill road not to far from my home and as i turned right on to it a newer Audi rs6 was going way faster than the speed limit so i pulled up to him but when a got close he nailed it so i did also and easily cough up but then slowed down as i was worried about intake temp as it was right around 100 that day