21.5 MPG Can This Be Right???

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When I recently purchased a 2000 F250 with the 7.3 the temp/compass/fuel mileage computer was broken. I found a place to fix it and just got it back today. After hooking it up I had to go try it our so I took a trip to town. On my way I set the cruise control on 60 MPH and didn't have to take it off until I got close to town, about 15 miles. The reading it was showing when I got to where I had to disengage the cruise control was 21.5 mpg avg. Is this right? the computer seems to be working as by the time I left town for the return drive home the average mileage was down to 17.1. On the trip home the mileage increased to 18.7 so I'm guessing the computer is working. What do you think, is this close to what you get? I'm not so concerned with the low end number as with enough miles it won't end up at 17 around town, but will I get 21 at 60 mph on the open road?

[ridiculously_necessary]

those computers are also known as lie-ometers. the 17ish is probably more accurate.

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Originally Posted by ridiculously_necessary

those computers are also known as lie-ometers. the 17ish is probably more accurate.

That put a grin on my face. I can live with and believe 17ish. Thanks.

[cweiss87]

I don't ever believe these computers. I just took a long trip and mine was spring 14.6 but when I hand calculate it out I was at 18-20.

[Skew12]

Those computers suck. Hand calculated is the way to go. Keeping averages is a must though

[JEL]

I've managed to get that hand calculated, but with cruise on a long drive over flat ground through the desert. If you keep it at 60 with cruise empty, you'd be surpised how well thse tanks really can do. On a side note, my parents had this newer Lincoln Continental and the lie-o-meter claimed it was getting 17 mpg average, I hand calculated two tanks and that POS was only getting 13. Ford didn't do a great job with those displays.

[TenMore]

mine has never moved off of 13.7 sinse i bought the truck in 02....dont think it works bu i figure I get 16 to 18 mpg

[Young-SC-Owner]

ive gotten 21 mpg hand calc in my 350 srw a few months ago

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After driving for a couple of weeks with the fixed computer, it seems to be indicating about 17.3 as the average fuel mileage. My guess is if I could set the cruise control on 60 mph on a flat road it probably does get about 20 mpg, but as soon as I have to stop and start there goes the mileage.

[F3507.3POWERSTROKE>cumins]

get around 605-610 miles to a tank with my 03 350, it has a 7.3 and a superchip

(30g tank)