With lucas, my BMW felt a little bit peppier... but butt dynos are relatively worthless.
With FP60, my fuel pump is quieter.
With MMO, my idle is smoother/quieter.
None yield the ability to reduce octane from what is demanded for the car (91), or give me higher MPG (carefully recorded, as I do for all my cars).
FP has the benefit of not effecting wear as seen in UOAs. Most other cleaners will effect... Not sure about MMO or Lucas, but it depends on their formulation, I guess.
Lubricity is the primary reason whay I use an additive. In NJ our fuels are good enough to keep things clean... we dont haveany alcohol blended in, whcih I think helps. FP wins in the lubricity department, so its what I use in 9 cars.
JMH