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.
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2014 ES 350 Starfire Pearl/Parchment
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.
2008 LS460 Black/Black
Prestigious Society Bypass Module. Staggered 20" TSR Wheels/Falken FK452 Tires, painted calipers, LED "Audi Style" DRL's, Full LED interior, 5k HID bulbs, 20% tint, Vaistech IVIC-D, LED Tail Lights, LED Turn Signal Mirrors