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car very thirsty?

hi i have a porche boxer and i put 5 pound petrol in but only getting about 20 miles on a good run any help please
james, April 2009
hi john tried what you suggested but not mch better about 21 to the gallon. maybe need a porche deisel can you recomend one thanks james

james, April 2009
£5 petrol = 1 gallon so 20mpg is what I would expect!!!

nigel, April 2009
Take your right foot off the accelerator pedal you obviously got a heavy right foot!!!

n, April 2009
many thanks john will try this method first thing sunday morning

james, April 2009
Just for a start, replace the air filter and spark plugs - these are the main items that affect fuel consumption. You need to make sure that the brakes aren't binding, too, and that tyre pressures are correct.

John, April 2009
link Click here to see other fixes for Porsche 911 Boxer.