It's really not a big deal. The tank is 5.5 gallons and is designed to last 10K-ish. If my 2013 Cummins is any indication, this estimate is accurate as long as you're running empty. Once you start towing it goes through it at a much quicker rate.
You can buy the 2.5 gallon containers at Wal-Mart for about $12, or fill up at many truck stops for $2.79 a gallon. I wasn't a fan of it at first, but it's much less of an issue than I originally thought.
You can buy the 2.5 gallon containers at Wal-Mart for about $12, or fill up at many truck stops for $2.79 a gallon. I wasn't a fan of it at first, but it's much less of an issue than I originally thought.