I just got back from a 9500 mile trip out West. I checked it every step of the way. Most of the driving was off the Interstate, I like the US roads. Some mountain driving included. I got 21+ for the trip, and driving a 2010 Dodge Grand Caravan. About half way through the trip I added a 36x36 rainproof, cloth, roof top carrier. Some say that will drop mileage, but I didn't check the before or after I added, just the entire trip.<br><br>I would definitely like to have just a little more room when I travel, but I also want to cover more territory and see the sites, so this is it for now.