I'm famous-notorious for driving the oldest vehicles in the neighborhood (eg - 6 yrs ago, my daily driver was a 1967 Olds 88) so when I had to upgrade after the rear bumper fell off my 1979 Cutlass due to frame rot, I decided to upgrade to something from the 21st Century. So I now own a just-off-lease Cavalier Z24 5-speed which is loaded, and also my first ever FWD car, but is actually kinda fun to drive. Miles of smiles so far. But I keep seeing ads for "fuel injector cleaners" and finally bought some today, thinking that these newer cars are more finicky and maintenance-needy than my old carbureted dinosaurs. Pop the seal on the STP bottle, and damned if it doesn't smell like old-fashioned Kerosene (only 100X the price).
Bottom line: are these additives beneficial in any way, or am I a victim of marketing hype? Any experience here?