Im going to the strip this weekend in plans to hopefully win some cash. last time i went, i ran some 112 in my bike and ran a best ever of [email protected] 145. i have the chance to get some of the u4. the difference is,, i can buy the 112 by the gallon at 6.75 a gallon compared to the 5 gal minimum u4 at 80 bucks. i know every tenth counts and from what i hear the u4 is the shiznit. IS IT????? how much should it pick me up and do i need to drain my tank if i have some left over???i usually drain my tank and add around half a gallon evry so often. i heard that if i leave the u4 in my tank that it will gum up.....true or not???