What are your mpg gains then? As I am still a bit dubious.
Well, on LPG and diesel power plus I was averaging low 50s. Within 2 tanks of sport 4, my long term average in the car was up to 58+ mpg. It also for the first time read a range of over 600 miles on a fill-up (once I drove away from the garage) - Never actually got 600 yet, but 540ish miles before the beeper is now a reality.