Just reading thru the Manual for my new 2014 Silverado and came across this,, "For gasoline engine vehicles, use of the recommended fuel is an important part of the proper maintenance of this vehicle. To help keep the engine clean and maintain optimum vehicle performance, we recommend using TOP TIER Detergent Gasolines. See www.toptiergas.com for a list of TOP TIER Detergent Gasolines." The dealer never mentioned it to me. and honestly I never heard of Top Tier fuel. ( My old truck never seemed to care what I poured in it ) Here in Minnesota there are "Super America" stations all over the place and I have always just got gas from them. when I went to the www.toptiergas.com site and looked at the Retailors tab I didn't see SA on the list of Okey-Dokey Stations. I am wondering if anyone has any ideas to what TT fuel Pro or Con is all about. I sure don't want to mess up a new truck I plan to keep for a long time. if you are a Pro User of TT fuel, are there stickers or something on the pumps to be able to tell if they are in the TT program ? this is all new to me.