My original commuter was a 1987 Schwinn Cruiser Supreme to which I added lights fenders and a heavy-ass steel rear rack. My headlight was a 20-watt halogen with a 4-amp/hour 12-volt alarm battery. Since I rode for fitness I figured a little weight wouldn't hurt, and actually help. One day I weighed it on a hook at the bike shop. With battery, heavy duty rear wheel and one water bottle it was 43 pounds. In 1997 when the inadequate side pull brakes failed and left me to Flintstone at the end of a 50-mph downhill I removed the rear rack and seat and tossed the bike in the dumpster. I bought a new bike, mounted the seat and rack and still have that bike and the rack.

ANd FWIW That Nishiki MTB-Based commuter is about 32 pounds. My old steel roadie is ~23 pounds, and the new commuter is somewhere in between. My average speed and ride times are fairly equal for all three bikes, but that's in traffic.