I used to use various injector cleaners Techron, Seafoam, Amsol PI, etc. but never could tell any changes in the operation or economy of my cars, so I have not used any for the last 3-4 years. Cars are still running fine.

 

I saw that episode of "Fifth Gear". I was shocked at the results. If I recall correctly, of all the modifications they did, adding the cleaner garnered the best result.

FWIW, I ran some cleaner through my car as I did'nt know what the previous owner used for fuel. I may run a bottle once a year. I've used Lucas before on my BMW and may again on my LS.