I have a 1997 Lumina with a 3.1 engine, 4 speed automatic with approx. 400,000 km on it. I used your Fuel Injector Cleaner and it caused a large increase in my gas mileage after the second bottle. My mileage low is 13.5 mpg to a high of 27 mpg, this must have included highway driving. Average gas, 18-20 mpg. 1997 Canada fuel consumption guide for new car buyers call for 20 mpg city and 38 mpg on the highway.
My car engine service light came on and it was diagnosed as overdrive slipping. I took it to two transmission dealers for road tests and they said it would have to be replaced. It would buck at 85 km on the highway. I put in your Transmission Fix after about 12 day the engine light went out and the tranny was operating better. THIS WAS 55,000 KMS AGO!
All the products you sent and I tested, have improved the operating performance of the car.
I gave a sample of the Fuel Injector Cleaner to a 1999 Ford Crown Victoria owner, and his operating cost decreased. He was $1.00 to a $1.50 in fuel costs instead of $2.00 per $10.00 of income.