at constant 14.7:1 afr my high comp zetec turbo will do just over 260 miles with 43 quids worth of juice on a long cruise

i get a nice brown tinge on the tip of the exhaust so i know she is burning the fuel nicely

i have mapped it so it uses 14.7afr up to 3psi then moves over to 12.2 to a bar then 11.8 above that

so i can drive economically by keeping the boost below 5psi