I've tried the gels and chews--I started needing a carb boost at about eight miles/75 minutes of running--and I realized after using a few and reading ingredients that they were thinly disguised corn syrup. So I've switched to dried fruit (apricots are great--taste good, bite size, don't dry your mouth out like sports chews) and organic gummi bear/Swedish fish knockoffs. ;-) Much cheaper and probably slightly better for me.
I think for runs longer than 11 miles, I need a carb beverage with electrolytes. I had serious nausea issues after this last run--not just running out of steam during it. So I'm going to be trying a couple of brands of sports drinks, and probably adding a squeeze of OJ or lemon juice to it.