Ok, so I did 48km of local commuting on Monday, of which 40km was home to GF, home to office, home to gym, home to SRAM service centre, and all of these were suitable for green commuting. the only exception was the trip to Menlyn Park to exchange clothing - no secure bike parking, and too much stuff to carry. So the resuts for day 1:
1. Fuel saving: R40.
2. Exercise value: 120min ~ 800kcal
3. Time lost: ~60min
4. Sustainability: High