I have Honda HRX 217 GSV190 Hp 5.1, Echo PB-2520 and Echo SRM-225. They are about 3 years old with E3 plugs.
Honda run time is 1h 15m and capable to cut 12-18" grass. Honda are known to run super clean emission.
Now run time 1h 45m with carb mod and motor/gas treatment. Capable to cut 18-24" grass. It definitely has more torque/power and its super super clean emission. I have notice tiny bit more power with Tribo-MAX Fuel+.
Echo weed eater has increase power and burns clean with Tribo-Max 2 cycle oil. It reduce cylinder temp by 30F.
Echo blower has increase power and burns clean with Tribo-Max 2 cycle oil with the carb mod its more torque. After 1 year I had to adjust the high idle speed and I gain 700 rpm from factory W.O.T. 7500 rpm. This was done before the carb mod.
I had to drop the idle speed 200-500 rpm after one tank but what I notice after one season no longer need to choke the carb. Both blower and weed eater. I tried other high-end 2 cycle oil nothing comes close to Tribo-Max 2 cycles oil.