which is a good thing. I normally don't let my truck get really low on fuel, but this time I let it get to 50 miles DTE on the dash display (driving around town locally). When I filled up, it took 30.5 gal. So that left me with 5.5 gallons with a 36 gal tank.
So theoretically I had around 100+ miles true DTE. It's actually kind of nice to know the true amount of distance you have when the gauge gets that low. But as I said before....I normally never let my tank get below 1/3 to 1/4 full before filling back up.
It's still a gamble to those who live on the wild side and take it to the limit .

 

Don't forget that as you drive it lower than the minimum amount, the pump can begin to suck air. This can cause the engine to sputter or run excessively lean for short periods, and could cause damage. Historically, this was an easy way to cook a catalytic converter. Modern cats are more resilient, but it can still cause engine issues.

The other thing that can happen is going up or down a hill, the gas can slosh to one end of the tank and stay there. There is ribbing to allow gas to slosh towards the pickup and get trapped under it, but on longer hills that trap may not get replenished in time by the next slosh.

 

Good tip about the low fuel. Too many people have been stuck by pointing their truck downhill with 1/4 tank. I may or may not have had that happen to me in the driveway.
Not sure how long it took for it to stall out, but I can imagine driving down a 6% grade for 5 miles may be enough to trigger a stall condition. Once leveled out, it may restart though.
It took pouring 7 gallons of gas into the tank before mine would start.
When I hypothetically returned home at night with 80miles DTE, I was really shocked that it ran out of gas in the driveway. Once it finally stabilized, after driving it into the flat garage, I had a lot of DTE remaining (can't remember now), but it did take a few minutes or so for it to calculate that I was longer zero DTE.

 

Not sure about the 2021 F150s in particular, but it can take a long time to purge air out of fuel injection tubing on many cars. Simply running the pump doesn't purge air, as the air has nowhere to go (it compresses a good amount though). Shops will usually hook up a purge tool to the fuel pressure test port and bleed the air out. Though simply cranking it for a long time can often do the trick.

 

Mine was a lot closer, powerboost 30.6 gallon tank, pulled in with 1 mile DTE, and it took 30.3 gallons, was at 19.5mpg so theoretically had 6 miles left, 5 more than DTE showed. Repeated this again and it again took 30.2 gallons, so it seems like it gives you about 5 miles past 0 to find gas.

 

i have a 36 gallon tank and my distance to empty was 10 miles when i filled it up, only held a bit over 30 gallons.

 

That would be about the same as mine. I don't plan on ever letting mine get that low again. 😊