Gas Waste/Cost

[Diablo]

Hi i am planning on trying to buy a excursion 7.3L I was wondering what the avg mpg it does because i see numbers different everywhere and one of my friends that works at a shop told me ,,, lets say you buy an excursion and at the beginning it does about 18 to 20 mpg, i heard that as times go it will start going down and eventually end up at 9 mpg and not move from there, thats what happen to one of my friends, is that true?

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[BuzzFlood]

It is highly unlikely that a vehicle's average mpg would be cut in half, just because the vehicle got older. It is more likely that the mpg differences were the result of different vehicle usage. Perhaps the high mpg figures were observed when the Excursion was used on long highway trips with a light load, while the low figures may be the result of stop and go driving with heavy loads. Deferred maintenance could also result in a less efficient vehicle.

I've noticed smaller decreases in mpg in a couple of vehicles that I've had for a number of years. I attributed that to the increased percentage of ethanol mixed into our gasoline, since a gallon of ethanol will give you less mpg than a gallon of gasoline.