FWIW....I get between 16 and as high as 24 mpg in my 2wd astrovan depending on a raft of things. Not the least of which is whether I buy real gasoline or 10% ethanol.....which may be anywhere from 5% to who knows how much depending on evap, length of time in a tank, water content, etc., mostly more rather than less methinks. This is totally dependent on availability. We happen to have a station in my town who tries to carry real gas only...even that is dependent on his supplier.<br /><br />If you think all gas pumps are equal, you are dead wrong....some get passed up for over a year by the BOW&M, maybe more. I buy gas at the cheapest station in Socorro, NM on my way back from Albuquerque but one look at their beat-the-crap-out-of pumps and I always wonder how true they are....and how much I am really getting.<br /><br />Wind, tire pressure, road surface, drafting behind trucks, as 2013YofV said already...so many variables including how much slip in an older auto transmission, how you drive.....endless variables....<br /><br />I think my Astro does a good job of giving me close to 20 mpg average and I drive it a lot...back and forth to the PNW, Mexico, etc. I do not know how a AWD astro would do though. <br /><br />I have a friend Jon, who has gone with me to the RTR, who drives a 1996 Dodge conversion van and he claims 20 on the highway. He has a button on the dash he can push at highway speeds that gives him an overdrive of sorts. He claims it is a two speed rear axle but I believe it is a transmission OD...neither of us is going to climb under it and find out tho...when he is city driving he gets about 16 mpg. It is powered with an FI 318.<br /><br />Just me, but I rarely really believe anyone's MPG claims. I am a total cynic and rarely make my own claims. As a kid I was shown how to drive by an excellent driver and have driven professionally at times over the years. I know how to drive getting the best mileage and I keep my vehicles in good tune and am religious regarding PM....that said, I almost never get the MPG other people crow about with the exact same vehicle.....I don't think they are smoking crack necessarily or stupid but I think it is all too easy to round their numbers to their advantage and to inflate the claims, etc.<br /><br />I have a book written by a Canadian couple who drove their older Class C to Panama and back. On the trip, the man carried a measuring vessel to check fuel pump accuracy....the measures were not all equal to say the least, even in the states. Once across the US/MX border it really got bad....as much as 6% in their favor....your call on what to believe....<br /><br />As you know..YMMV<br />Bri