I am looking at purchasing a F350 SC DRW 4X4 with a 4.1 axel (Tow Boss package). Does anyone have any experience with this axel? What would be the difference in gas mileage with the 3.73 vs 4.1? I would like to have the higher towing capacity (pulling a 5<SUP>th</SUP> wheel) but, I am looking at doing a lot of traveling and I concerned with the gas mileage. Thanks!:confused: