Have a new Expedition EB Max with a 33.5 gal tank. Couple of weird issues driving me crazy. When we fill and reset the trip milage it tells 425 miles to empty and gas guage goes to full. Within 20 miles the gas guage is going down is is down to half by 100 miles. Last Expedition we had would go 100 miles without coming off of full (and drop rapidly after that . The message center tells me I'm running low on fuel as the tank goes to empty, and have X miles to empty. Yesterday it was 8 miles to empty, but when we filled, it took 27.8 gallons. So the message center registers the fact that it should go over 400 miles on a tank...but then bombs out. Dealer tells me to "consider it a reserve" I haul a camper and 3 kids in this truck regularly and need to be able to trust how much fuel I have.

Any ideas?

Husker EB Max