ji603

Ran mine till display said 3 miles to E

ended up putting in 25.61 gallons. Have a 26 gallon tank, so it's on the money.

Viper238

I've got 27,000km or ~17,000miles.

It's pretty accurate. I only find it go wierd if I don't fill it. and just put in $20 of fuel.

Then i find the accuracy goes funky.

For the most part I find mine pretty bang on.

Bottom Dollah

Ran my XLT 4x4 down to 30 miles before E. Ended up putting in 34 gallons of fuel. On board computer sez I was getting 19 mpg so my computer was only slightly off. I use it constantly.

icantdrive55

There's a number of ways the CPU could determine miles to E, and I don't pretend to know the exact algorithm that Ford uses to do the calc. That being said....

My best guess is that the calc is done using the Avg MPG calculated by the CPU and a digital readout of fuel remaining in the tank based on the sending unit readout. So, let's assume your Avg MPG is approximately correct (i.e., you haven't recently reset it and it's giving a readout based on a number of fill-ups over >1000 mi). My experience with the sending unit is that it isn't particularly twitchy, but that tank level is fairly critical, esp at low fuel levels. I've seen the low fuel warning light pop on (at the standard 50 mi to E point) when I know that the tank had plenty of gas left. This occasionalyy happens when I am getting into the bottom of the tank and I'm either going up or down a steep hill and/or accelerating/decelerating at the same time. Figger the float is in the center of the tank and so reads low momentarily as the fuel sloshes to either end of the tank.

Once the warning is lit, it won't go out unless you shut the ignition off and restart, so as long as you drive with light on, it will continue to subtract miles traveled from the miles to E, giving an incorrect reading. Next time your warning light pops on, stop on the level, turn your truck off, and restart. See what happens...

Now, I can't guarantee this is how the darn thing works, but the few times I've run my truck down to close to E, the fill-up amount was pretty close to what the CPU was telling me. FYI, I've got the 26 gal tank and my CPU reads about 0.5 MPG higher than if I do the calc by hand. My suggestion is fill up when you get within 50 miles of E and quit worriying about whether your CPU is lying to ya....it's a truck, not a computer.

iamsuperbleeder

I haven't ran mine to E yet... I don't want to see myself spending that much money on fuel all at once, lol

cueman

I got down to empty on the computer and it was still about 3 miles to the fuel station. I made it with about 1/4 of a gallon to spare. This was all on flat roads. I think it is very close.

jt_04

isn't that why they have baffles in the tank, to keep the fuel from sloshing around too much? sounds like they are blowing smoke

Munshaw

I was coming home from a long-haul camping trip last weekend when my "gas light" came on and said something like 80 km to empty. I was about 80 km out and the only gas station I passed was one that is known for jacking fuel prices so I skipped it thinking "there's probably a small reserve below when it says its supposed to run out, they build things idiot proof these days".

Well, when I hit the last stop sign less than a mile from my house, the screen showed "0 km to empty" and sure enough it died right there. Had to walk home and grab some gas.

Lesson: the "fuel left to empty" warning is fairly accurate! I wouldn't push it that close again...

Bear's FX4

I ran my 2010 FX4 5.4L down to 4 miles to empty and put in 35.7 Gallons in a 36 Gal. Tank so my computer was accurate.

islander

Okay, then mine must be screwed. I left my house yesterday and it read 246 km. to empty. Drove about thirty km. and it then read 360 km. to empty??? Gained an extra 114 km. after already having driven thirty????

And before people start throwing out ideas, I have had many vehicles with mileage counters and they have always been extremely accurate, this one isn't.