I am beginning to think it’s how it’s driven after you fuel up. Call me crazy, but my truck had been locked at 20% for a while, and I think it had to do with that I filled up the tank at the gas station that was 0.5 miles from my house and not giving the truck time to go thru it’s calculation. I’ve started filling at a station that is 5+ miles from home. Also to note...the manual calls for an FFV truck to be driven 7 miles or 5 min after fueling.:.im pretty sure now both need to happen instead of one or the other. My truck now consistently reads 11%- which is correct as I use e10- when it was pretty much locked at 20%for a year.
Maybe that is the case. I don't drive much. 14k on my 2017, that will be two years and one month old on the 19th of this month. Fuel station I use is 4.5 miles from my house. Often I fill up, then hit the grocery store, which is only half mile away. Then I head home, which that route is only 4 miles.
I have not monitored it since it locked at zero. I checked it several times, over several months, and it was always at zero, so I stopped reading it as I had read here that once it locks to zero, it needs a reset.
I normally only need fuel every 2-3 weeks.
However, my 2010 I did the same thing with, same fueling station, same grocery store, and it never had an issue, even though it was in the problematic year range.