Yes, very useful for me, as it directly affects the average speed I can expect when I plan my rides - there's a direct correlation in my records between average speed and feet/mile. A ride with 100ft/mile can take me twice as long for the same distance as one of only 50ft/mile. Therefore this affects when I decide to start the ride - the hillier (slower) ride will start earlier in the day, and end about the time I like to get back.