i seem to be lacking the time to rack up mileage on my new stryker. only made 423 miles in 2 months because it was too hot. since i ride in DC rush hour traffic a lot, can i base a break in oil change on engine hours, instead of mileage?? i only work 14 miles each way from work, but bike is actually running for about an hour each way. other words, running time vs. mileage.