I have owned a 1992 Honda Accord Ex for over a year. As of yesterday, the car has 160,000 miles accumulated. Ever since I bought it, I’ve put around 26,000 miles on it. The day I bought the car, I noticed a slight sluggishness at idle and at cruising speed (around 2300 rpm). I figured it was bad gas, but it never went away. In the year I’ve owned it, I’ve replaced the spark plugs, plug wires; air and fuel filter each time expecting the problem to go away. I started thinking the computer was malfunctioning, so I visited my repair shop. Once again, nothing was found wrong. I was looking through a magazine and found your ad about the Styrofoam cup, so I decided to try you out. I purchased a can of B-12 Total Fuel System Cleaner, found a Styrofoam cup, and put a drop in. The bottom literally dropped out. I found another cup and tested Red Line SI-1 and waited. Nothing happened! It’s been two days and my car hasn’t hesitated yet. In fact, the car starts and drives better than ever. Last week, I recorded 23.23mpg. I’ll let you know about my gas mileage soon.