I saw about a 1 mpg increase when switching to Swamps 175/146 Single Shots from stock split shots. 15-16 mpg around town and 18 highway if I can keep my heavy foot off the throttle, truck is a 2WD - so it's a bit lighter. Truck definitely holds ICP much better than before and I love towing our 31' 5th wheel with this setup, better power and EGT's seemed to drop a bit also. They are a bit louder at idle......but I like it.
No regrets here.
No regrets here.