I have used some of their competitors (like Amsoil, Power Service, E.T. etc). Some worked, some I couldn't tell a difference. But Amalgamated's TDR-FL product blew them all away. I went from 6.72MPG to 8.1MPG after two tank loads. Ran the same route with nearly identical load weights so I'm sure it's not fluke. You have to buy it direct from the website, but their product is worth the effort.
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