I have a 2009 ford E250 I am runing about 17MPG i set it at 68mph in both 65 and 70 mile zones that is where i get my best mpg and most runs are rated at a speed of 45mph. I also have a 2005 ford E250 AND I am geting about 15 to 16 mpg in that one and both are 34 gal tanks so the price is not that much def in van or sprenter if you look at size of tank and price of fuel and def with the new sprinters the best thing I see is a small box truck under 10,000 GVW im looking to add one to my fleet to see how it works