Hey Bill,Gotta love Ken's post since he's got 8 injectors and two of everything else and was going an average speed to 80-85 mph in a long 65 mph zone. No dish on Ken he is one of the most stand up guys I've ever meet.
I have only 6 850 cc injectors (67mm turbo (spssgt850w)) and get 26 mpg on the highway with some pulls and normally get about 21-22 around the city. I run the aem ems and tune for an afr of 15.0:1 while under flat cursing of up to ~80 mph. But drop to an afr of 11.7:1 under load On a road course I normally get about 4.4-4.7 mpg... depending on the course. My wrench is that I spray meth above 140 kpa (20.3 psi) and pull out about 24% of gas flow when boosting above 20.3 psi. Still it give me 26 mph on the high way and 21 mpg city.