Listen folks google Ethanol Damage and see what is going on these days.  Our engines are being burnt up due to the ethanol in our gas.  You have to use something to help with the drying effect of ethanol.  I use a couple things, MMO Techron and this product.  Techron is a great cleaner, but does not help lubricate the upper cylinder and this product does.  MMO is like between the two products, a decent cleaner and a decent lube.  Lucas Upper Cylinder is the "Lube" only, even though it says cleaner it is not.  The "cleaner" is a product they use in oil that cleans, but not in the sense as you know what a cleaner is.  The cleaner in MMO and Techron are flat out solvents which are very good cleaners.  This product has no solvent, and the cleaner is an additive that cleans similar to what calcium does for engine oil.  Whether or not you "feel" a difference has nothing to do with your cylinders needing this lube to protect your engine.  I actually do feel a difference sometimes in various vehicles, and also I have not felt a difference in others.  Some day your engine will be burnt out and you will have wished that you used an upper cylinder lube.  Gas has a natural oil lubrication, ethanol does not, and that is why you need to add extra lubricating oil to it.  26 bucks a gallon with free shipping is a no brainier, a gallon lasts me over a year.  I buy a small 4 ounce version from the auto parts store and use that to refill with my gallon.  The gallon gives you 32 gas tanks worth of treatment.I actually don't like Lucas's product line.  Their oil products are junk if you ask me.  But this product is the real deal, and whether or not you buy Lucas or another Upper Cylinder Lube, your engine needs these types of products to minimize the damage that ethanol is currently doing to it.  Use a cleaner like Techron once every 4 tanks and use a lube in every tank.  I've seen newer engines with 25k miles on them that look like burnt out engines that are 40 years old.  THIS IS NO JOKE, THE U.S. GOV'T IS GIVING US THE SHAFT BY FORCING US TO BURN ETHANOL IN OUR GAS.