I topped up my tank today, after 404 miles of city, town, country and motorway driving (a good mix of each). My calculated mpg was 53.3. However, after filling up the tank at the top of the town, a gentle run home, through a quiet 40 mph section, saw my average mpg indicator reach 103.8 mpg. (This is an average, not an instantaneous value. Mk1 Jazz doesn’t do instantaneous.) This is a new record for me. 75 to 80 mpg is the norm reached on this run home. After a rather steep climb from the filling station it is mainly a gentle descent, with several flat sections, but it is interesting to see just what can be achieved in ideal conditions. Next time I go out, into the busy traffic and with a cold engine, it will soon be back to its normal 50-55 mpg.