only 700miles of smiles... best has been 30mpg doing 80 on NY turnpike with a lttle traffic. Things pulls, it's quiet, love it so far. Only thing I dont like is the 0-20 oil. Thats baby oil. I se no reason why 5-30 ESP wouldnt be safe for the SCR/ DPF and decrease mileage. The oil pump will be fine, everyone is all worked up about the belt driven pump. If you have to pull the tranny to replace the belt, I can see that as expensive if you take it to a shop. It is something you can do on a lift if you have access to one. Plus I am sure the belt would last a lot longer than 150k, I have seen timing belts last for 200k plus on gassers turning 3000 rpm all day. My 3.0 does around 1500 at 80mph, maybe less. The pump is variable and nobody really knows how long it will last.