That seems like reasonable mileage to me. Check this out for some real world mileage. http://www.fuelly.com/motorcycle/suzuki/sv650s looks like you are on the high end for 2005s. Interesting how the mileage seems to be substantially better on some of the newer models. Also, I really wouldn't say 47mpg is bad. My KLR gets about 46 on average, my duc gets around 40, only my 80cc 2 stroke scooter gets as high as 68mpg.