DEF tank size
We have a new 2013 Fleetwood Expedition. I thought the DEF tank was suppose to be 5 gallons. It read at the dash and the tank gauge half full. I added 2.5 gallons and it only came up to 3/4 full. ...
Forum Discussion
On my Ford, the tank is five gallons. When it said it was 1/2 empty, I bought a 2-1/2 gallon container and poured it in. It took all of it. Then, the next time when it was showing 1/2 full, I put the same amount in, and it was full after only 3/4 of a bottle. I think the gauges/monitors on the DEF tank are about as accurate as the gauges on your typical RV black tank. On the good side of things, I'm getting about 1100 miles per gallon on my DEF.
