I was using Lucas fuel treatment and noticed no real difference, no harm no foul. Another forum recommended two stroke motor oil with some success. Currently trying a combo of 8oz 2-stroke and 8oz PowerService (white) per fill-up to see how this works. I guess as long as you are adding something to increase lubricity is better than nothing at all with the new ULSF.

The gassers are another story as the Lucas brand has helped considerably with highway mileage and use 1oz per 3gal for each tank.