My cycling computer keeps average speed for total time riding as well as time riding but only if you are moving -- if i stop for a rest the computer stops. Mine might say 11.5 for average speed but that is also including time i am at the fishing pier and walking my bike out on the pier which is a few mph and that sucks down the average for sure. My "riding" speed is more like 14-17 when i am just crusing along.