MPG-Again!

[Sparty92]

Another MPG question

Hey! Here's another wacky MPG question!

So I just filled up my new '07 for the 2nd time. The "low fuel" warning message was displayed...and said about 38 miles to empty. I fueled up, but only 10.XX gallons were pumped before the pump stopped. I hit the lever again, and it stopped like 2 seconds later.

I forget the exact trip odometer reading, but when I divided the trip odo (200+ miles) by the 10 gallons pumped, I got like 21.XX mpg.

I know our tanks (S197) are 15 gallons....so I'm puzzled when I saw the needle a couple hairs above "E" and the 'puter was telling me 38 miles left! (I guess I had 5 gallons left?? To go 38 miles?)



When I got in the car, the 'puter said something like 265 miles to empty (if I recall, the first time I filled up it said like 315?). The needle didn't quite peg the "F" mark...it's about 1/16" away.

Can anyone help me figure out this crazy math?

 

[DarkFireGT]

When the computer shows 0 miles to empty, you should have roughly 1.6 gallons of gas left, if that helps...

 

[Sparty92]

OK...

I think I figured it out.

The car doesn't like fuel pumped into the fuel tank too quickly...it was shutting off prematurely.

I went to the gas station today and was able to get about 2.7 more gallons in the tank. The computer read "316 miles to empty" which is what I remember from the first time I filled up.

Problem solved.

 

[kooldawg6]

I've never noticed in the day time with no lights on, but at night with the dash lights, the gas gauge will all turn red when you approach 10-15 miles to empty. Pretty cool.

View attachment 370571

 

[Ice Hawk]

Thats a really cool feature. I've never read about it before on any spec sheet. Pretty niffty.

 

[Swordsman]

Seems like more and more cool features keep showing up with the interior upgrade gauges. They should really talk about them more on the Ford website.

~SM

 

[V8JamesGT]

i dont think its good to let your fuel run that low... I did mine before and then my throttle position sensor went bad. I can't say for sure it was my low gas but thats when it started messing up. Luckily it was fixed under warranty for free

 

[Swordsman]

I've never noticed in the day time with no lights on, but at night with the dash lights, the gas gauge will all turn red when you approach 10-15 miles to empty. Pretty cool.

View attachment 370001

Hey, I wonder if the other gauges go red also? Think the temp goes red if it gets too hot, or the batt goes red if the voltage drops too low?

~SM

 

[kooldawg6]

Nearly 100 tanks in my Stang and very, very seldom do I fill up before I get the low fuel warning. I tend to do it before it says 20-30 miles to empty.

 

[Frank S]

i dont think its good to let your fuel run that low... I did mine before and then my throttle position sensor went bad. I can't say for sure it was my low gas but thats when it started messing up. Luckily it was fixed under warranty for free

I agree it's not a good idea to let the fuel level get too low before a refill. Over here in earthquake country there's no guarantee your friendly local gas station will be able to fill you up if it gets real shaky all of a sudden.

Seems to me there is a TSB about gas tanks not wanting to take on fuel when they are not near empty. That may be a reason to fill only when near empty, but an even better reason to visit the dealer and complain.