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Tool Talk Discussion Forum

Re: car fuel mileage

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Nate V. IA

01-24-2013 18:46:49

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I wouildn't trust the digital readout, what is she really getting for milage. Miles driven divided by gallons pumped in? That is the most accurate way of getting mpg. My wifes car is off 15%, that alot in my book. Is she letting it warm up for half an hour everyday? My truck has been known to get 2-3 miles per gallon in the winter, then again I rarely drive it-2002 K2500 with 8.1 gas hog, pocket drainer and optional 4.10 rearend. I get 8 mpg on a good day.


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01-25-2013 04:53:23

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 Re: car fuel mileage in reply to Nate V. IA, 01-24-2013 18:46:49  
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The newer Fords dash computer actual measures based on the fuel put through the injectors(pressure*Pulse time*revs/ABS wheel revs). In every case where I have ever checked they have been within 5% of what the "fill it up and watch your miles" method gives, IMHO 5% is as close as you can get with the fill up method. As such I'd trust the dash first. Pretty fun toy to play with when you reset it at a stop light and screw around some.

Short trips and cold weather will make your mileage suffer terribly. Particularly if you let the car "warm up". My daily driver DOHC V6 Ford is is under 20 right now an usually does 27 or so.

Pushing snow, snow/studded tires?, increased rolling resistance from lower tire pressure, more alcohol in the fuel, warm ups... it all adds up.

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Centex Farmall

01-25-2013 20:08:25

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 Re: car fuel mileage in reply to RGMartin, 01-25-2013 04:53:23  
We have an '07 Ford 500 and the computer gives the same result as manual calculation. It's surprisingly accurate.

I usually get between 31 and 32 with mostly highway miles but on some tanks it will drop to 29 or even 28. I think there's a difference in the fuel density from station to station or batch to batch that is hard to account for.

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01-26-2013 04:59:01

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 Re: car fuel mileage in reply to Centex Farmall, 01-25-2013 20:08:25  
wow, an accurate guess-o-meter? Better call Guiness!

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