Just picked up a 2012 NV2500 V8 , 28 gallon tank, High Top. I also drive a 2002 GMC Savana 3500 with a V8, 31 gallon fuel capacity. With the GMC I do 273 miles on one tank of gas this is following speed limits and using a very calm method of driving. I will post back my millage for the Nissan in a few weeks using the same method of driving, carrying the same load. From what I read on this web site I should get a little more out of the Nissan.