" I noticed the gas mileage actually went up. I think the trailer breaks up the air behind the van and gives it a cleaner air line. Kind of takes away the vacuum that's created behind the square back. Just my opinion. Others mileage may vary"
I've experienced this with a roof top box on our 95 Escort Wagon on a near cross country trip. I keep track on milage and several tanks in the mid 40's - 44, 45, etc. �Best on a trip w/o box was below 40, like 38-39 mpgJohn