Horace ... they can last that long? I got a TT46 and an SC46, I "abused" (running on max RPM always) them and after 6-9 months the power has dropped by 20%. My G90 serves me well, been almost 3 gallons now and its nice but for a funny reverberating sound the engine has. Wooor wooooooor Woooooor wooooooor ...