My 06 must be "special" I can be reading 1/8 on the fuel gauge, no low fuel indicator, and my truck runs fine on a steep upgrade. Did Ford change something on the fuel pickup starting on 09 models?

 

Not sure, but seems to be much more of an issue with the 36gal tank.

 

I agree with not relying on the low fuel level light, but if you have to keep the 36 gallon tank at least half full...what's the point of having a 36 gallon tank?

 

Fuel is not getting to the pickup tube. My garage has a slight angle and my gauge reads 1/8th of a tank higher than it really is when I start it in the morning. I sit nose up at night. With the angle down, you're sucking air.

 

Well it was just the fuel. I figured it was the issue, just weird set of circumstances. At least it was in my driveway. The pickup tube is in the back of the tank and I had the nose of the truck slanting down the hill. I don't usually run the truck lower than 1/4 tank but in this case I was trying to see gas mileage on a full tank. I should of had approximately 4-5 gallons left. When I filled up I confirmed that. My driveway must be just steep enough to uncover the pickup tube before the low fuel light comes on.

Thanks for all the advice.