Yesterday my buddy and I were riding for about 4 1/2 hours. I on my 05 xr650l and he on his dr650. Throughout the day we noticed that my bike was showing a few more miles on the odometer than his, by the end of the day nearly 7, although we rode the same distances. Additionally, my bike ran out of gas long before his did, I had to put on the reserve tank at 66 miles, where he was able to stay off reserve thew whole day. I should tell you that both bike are completely stock, and have near the same milage on them. Those were the only two gripes I had all day, the bike ran hard and strong and we had a blast. Ya'lls input is greatly appreciated.