Not a Tundra, but my 5.7 Hemi w/90K miles got 9-10 towing & 16-17 commuting @ 65mph... It blew-up @ 96K miles & Ram replaced it under their 100K powertrain warranty... With only 3K miles on the new engine I now only get 7.5-8.5 towing & 14-15 commuting. It will likely take a couple years to get my old mileage back but I figure I'm good to go for another 100K miles w/new engine on fairly rust-free 2011 TV...
Prior to the Ram my DW & I have only owned Toyotas & Hondas... Would have loved to get a Tundra w/5.7 but the payload wouldn't handle our family of 5 & 8,500 lb. (loaded) TT... My inlaws just gave their Toyota Avalon w/200K miles to my sister & everything still works great... If Toyota made a 3/4 ton I would be first in line!
2011 RAM 2500 ST Crew Cab 5.7 Hemi
2011 Primetime 3150BHD Touring Edition
Days camped in 2016-36
Days camped in 2015-37
; Days camped in 2014-31