Hmm, I'm not sure on that one. My immediate instinct is another monkey pee product, but again, I really dont know.
As I see it, if you take care of your engine, give it a Seafoam and maybe off-car fuel system clean every now and then, then you don't need anything in a bottle. Another point, if you buy these products for oh, $20 a bottle, and squeeze up your MPG from 22 to 24, on an 18 gallon tank, thats 36 extra miles, or about 1.3 extra gallons. Lasts for what? 5 tanks? 6.5 gallons = $24. This is, of course, assuming it actually
works. Consider also, the time and/or labor charge all these methods may take.
Me? I take care of my car, change oil every 2,000 miles (I work at a dealership, so I get them whenever I want) I regularily check all fluids and components of the engine, and occasionally use Seafoam. My beast of a 1990 G1 Sedan with two seeping headgaskets and half a Napa store in the back seats and trunk gets 20 mpg and I beat the piss out of it.
Take it as you will.
