and, Longer Iron - your behaviour is shameful, you lost an entire mile of motoring over a distance of 120 miles - such waste!!
Balderdash and hogwash based on a totally false premise!
Currently I'm running a Volvo V40 T5 (a 40-series estate, 2-litre turbo-petrol

) Since late-february, I have not reset the computer, therefore, the AVERAGE fuel consumption is ~25.6 mpg. however, the last tankful was 26.8 mpg. calculated by filling when the same "miles remaining" shows and getting a receipt with the exact amount of fuel added.
Clogging it is fun!an old man's car that can spin the front wheels and out-drag an awful lot in the "traffic-lights grand Prix"....but that performance comes at a proce of single-figure MPG's on the instantaneous readout.As quoted by a previous poster, the total the average is taken over is all important.
That 1 MPG is reflected across however many miles the vehicle has travelled since the last computer "zeroing"
another "banger" driver! the car's a' 97 with cruise, aircon, leccy windows and sunroof, leather, towbar, alloys.....came with over 6 month's test and a couple of weeks' tax, all for £200....when I'm done, it'll drive into the scrappy's for 150 and the wheels/tyres, Blaupunkt CDradio and headlamps will fetch over 100.
now that's cheap and comfy motoring!