36k miles in 30 months. Not the most, but not bad. I use whatever syn or semi-syn oil is on sale and those cheapo Fram filters and change at 3k to 4k miles. The oil analysis I've had done says I should go longer on the oil as it still looks too good to change at 3k. Valves at 12k were good-to-go and the bike has gone 3k to 5k miles in a week (rain and cold) several times without a hitch. It's my 30 mile per day all weather commuter, so it gets all kinds of riding.
I've installed a 3.5 gallon tour-tank so it goes 225-300 between gas stops.
Of course, your mileage may vary