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Bumping an old thread. RH77 what was your conclusion on the TCW3 additive? I used a quart of pennzoil tcw3 in my suburban. Mixed it to the recommended dosage. My conclusion was the engine does NOT run smoother. The fuel economy got a little worse on every tank. I also experienced hard starting during the test period on multiple occasions. I think its placebo. My amsoil guy laughed at me. He's said "in 30 years I've seen people put a little bit of everything in the fuel there's no magic just buy good oil and good gas". The only thing that really affects mileage fuel wise for my suburban is ethanol free 87 octane. I pick up 5-12%.
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