I guess flashlights are OK if you're trying to find something in the dark, but for roadside repairs give me a headlamp any day. I carry a Princeton Tec EOS
headlamp. Runs for 44 hours on "low" with 3 "AAA" batteries, also has a Medium (10 hours) and High (2 hours) setting, you can aim it, no bulb to break or wear out (Luxeon LED), small size, waterproof, about twice as bright as a Mini-Mag -- what more do you want?
I also carry a "cap light" from Cabelas
for chores around the campsite. Runs on CR-2032 watch batteries.