I have a 2020 super duty with the 7.3.. Previous trucks were a 99 super duty with the v-10, bought new in march 98. Also a 2011 with the 6.2 bought used in 2014, All three crew cab long box. The 7.3 seems to be an awesome engine, although I have heard some grumbling of failed camshaft and lifters due to delaminating.. Gas mileage for all three about the same towing. The 7.3 is much better empty then the other two They had 3.73 rear axles, the 20 a 3.55) Being almost 60, I also have an everyday car, so this most likely will be my last new truck purchase as it is in the garage with only 18,000 on it.