MPG computer

doug527 · #1 (**permalink**) 11-02-2009, 09:59 AM

At 75% of highway driving my computer is reading I am getting 22 to 23.5 mpg, but when I calculate by hand it is 17.4 or so. Why bother putting in a mpg reader if it is just going to throw out random numbers.

09, 4.6 3v scab 3000 miles.

Whiteline · #2 (**permalink**) 11-02-2009, 10:13 AM

Hey doug527,

I've been watching this thing a fair bit lately, reset it at every fill and compare vs calculate by hand. I'm up in Canada so I've got to convert the gallons over to US gallons but I'm surprised how close it has been. It's been between 3 to 5% off, of course on the high side. But that's just Ford wanting us to feel good about our trucks, IMHO.

09, 5.4 screw, 38,000 km (23,617 mi)

silver05fx4 · #3 (**permalink**) 11-02-2009, 07:02 PM

mine is about two tents off ...today on a full tank i got 18.6 all high way

but reseting it is the key

Chris Anchor · #4 (**permalink**) 11-02-2009, 08:53 PM

I reset mine after filling tank and it's real close to hand cal, within 1/2 mile or so. I was impressed as the one I had in a Dodge was off a lot. Chris

spinrbait · #5 (**permalink**) 11-03-2009, 10:05 PM

Quote:

Originally Posted by Chris Anchor

I reset mine after filling tank and it's real close to hand cal, within 1/2 mile or so. I was impressed as the one I had in a Dodge was off a lot. Chris

i just filled mine up yesterday. it reset by itself i think. at least it changed from having 40 miles left to e, up to over 400 left to e. mine is saying i am getting 16.8-17 mpg. i have the 5.4 litre.
spinrbait