I've never had a direct problem from using Trx fuel, but I noticed a pretty big difference running Odonnel's. It was really noticeable at idle and low end. Really smoothed things out. Started a tad easier, too. Not much of a power gain, but my engine's pretty much worn out. Can't polish a turd! And the kicker is that Odonnel's is cheaper at the lhs. Win-Win situation.