I had difficulty with the gasoline-turbo application. Spark plug porcelin clean white, exhaust sooty black, cylinders washing, acted like it was lean and wouldn't spool the turbo, wouldn't rev up....you name it. Black soot the whole length of the exhaust side of the body! This happened with the stock (small) intercooler and with the huge unit we added in 2000.
I went back to the fuel truck and got the lowest "90 degree distillation temp" gas they offered (ignoring the octane numbers and the offered advice, etc.). The car went from 101 mph to 183 mph on the next pass, with NO other changes. It was running on a stock Toyota All-Trac Turbo ECU, without feedback control.
Seen that "heavy fuel" issue take down a number of folks, with and without turbos.
Just my 2 cents.
Regards, JimL