robgosty

Wonder if anyone can advise me of road speed and gearchanges on above car ,mine will not go into top gear under 40+ mph, even driving like there is an egg under throttle pedal,is this normal, and if not,is there any adjustment ???? might do s little to help my mpg, now running at about 20mpg, new plugs and air filter fitted, also stuff dumped in tank to clean injectors,
thanks in advance Rob