whoa whoa whoa, 6 ounces to treat ONE tank of gas? that is NOT how it works at all.
did your friends even bother to read the instructions on the bottle? you're supposed to use 8mL-10mL per TEN GALLONS of gas. my 2005 toyota tacoma has a 21-gallon tank so that'd be about 17-18mL in the middle range for me.
I've been testing it for a while and have been impressed with the results, myself.
Ideally, it should take 2 full tanks of gas before you see the biggest mileage increases, three at the most.
I'll do my best to summarize how it works, but I can go into greater detail if you like.
It does a few things:
-cleans carbon deposits in the combustion chamber (and, I presume, anything that comes into direct contact with combusting fuel), thereby restoring LOST fuel economy
It slowly cleans carbon deposits from your gas tank over the course of 1-2 tanks of gas. It works a bit like fuel injector cleaner in this regard, except FIC burns off large deposits right away. So with FIC you generally see a great increase in power right away (depending on how dirty your engine was before the treatment), but the problem is that those large chunks can clog or damage other components and give you other problems. eeFuel slowly removes those deposits, essentially giving you the same result as FIC: cleaning your combustion chamber components, thereby increasing the life of those components and restoring lost fuel economy.
-decreases emissions
-increases fuel economy on top of that.
These two functions are, essentially, performed at once. Insufficient testing has been done (I think) to actually measure the emissions of the exhaust; however, eeFuel does in fact dissipate - if not completely eliminate - vaporized fuel runoff.
Have you ever been driving and noticed that the car in front of you has liquid dripping or streaming out of the exhaust? That's unburnt gas. eeFuel helps this gas to vaporize more completely in the combustion chamber, with the result that this runoff is almost entirely - if NOT entirely - eliminated. This is technically a reduction in emissions, at least a reduction in LIQUID emissions, because you're not dumping gas onto the ground. It's also an increase in power.
Think about it: say you're burning 25mL of gas on a single piston stroke and 5mL of it is not vaporizing properly on that stroke. It condenses and makes its way through your pipes until it exits the exhaust of your car, kind of like a household A/C. Therefore, if you're burning this formerly-wasted fuel, you're going to get some added power. Before you were only burning 20mL out of 25mL but with the product you're burning all 25mL.
Granted, a 25% increase in fuel economy IS on the high side of estimates; average fuel economy increase is rated (according to the manufacturer) to be 10% - 15%, with many reporting around 18%. High, manufacturer-rated estimates are up to 25% but I have heard at least one report of someone getting upwards of a 37% increase.
I'd give you a bottle if I could spare it, but in any case I'd suggest at least trying it out. I have been for the last thousand miles or so, myself, and while I need to conduct some further testing to accurately measure my fuel economy I CAN tell you that it has yet to cause me any problems and it has in fact given me an increase in power.
And if you're concerned about potential damge to your engine, check out fuellegacy.com and look at the section that details independent testing. An Italian firm - Ferrari, I THINK - actually tested this in diesel locomotives for 26,000km (roughly 15,000 miles) and not only was there no corrosion damage in that vehicle's engine when they took it in for an overhaul but it was actually quite clean.
