with my 04 duramax I only had a 26 gallon tank. While along major citys/interstates, fueling isn't an issue, when you travel in the midwest off of major roads, through small towns, that small a tank leads to often filling up after 100 miles or so in order to make it to the next open station. I've been places where 250 miles between gas stations happens, especially at night. So when going in those areas I have an extra 10 gallons in yellow cans that I used.
Feel sorry for the gas folks with 25 gallon tanks and <10mpg, tougher on them.
Travel in eastern oregon and you'll find that when stations close at night, common because no self serve on gas allowed, you can be a LONG way between open stations. That will end this summer when counties with less than 40,000 people will be allowed to have self serve at stations between 8pm and 8am.
Diesel is self serve, but if they close the station for gas, they almost 100% of the time shut off power to the pumps.
With the 2015 and a 36 gallon tank, not an issue.