We (myself and the good lady) have been test driving potential new cars. Obviously there's lots to consider but I thought I'd post the results of out very unscientific tests of fuel economy. The basic idea is we pick up the car from the local dealer (we live in Norwich) drive home (which is on the West side of the city) and then drive westwards along the A11 to Barton Mills. This is a journey of just under 39 miles. 2 miles of low speed driving, 27 miles of 70 mph dual carriageway (4 roundabouts), 9 miles of single carriageway (2-3 miles (rough estimate) of which is 40 mph and the rest 60 mph). The journeys below were all weekend afternoons with essentially no delays due to traffic.This is what we got (numbers all from the car info systems):
BMW 116i Sport 41.7 mpg
Audi A3 1.4 122 TFSI SE 46.9 mpg
VW Golf 1.4 140 TSI ACT GT 43.3 mpg
The real interest here I think is the comparison between the A3 and the Golf. Obviously there are a many variables that can affect fuel economy. The temperature was similar on both days (-1 to +1), the the driver was the same (me), load the same (myself and GL), speed similar (basically the legal limit all the way), but somethings were different, it was windier and a bit wetter for the Golf and the Golf had done fewer miles (500 vs 3,500 for the A3), and somethings we simply don't know about (tyres, including pressures), fuel type, wheels size (17s on the Golf, forgot to check the A3), differences between the on-board mpg reporting on the two cars, etc, etc.
Because of all the variables (not least they're different cars, albeit on the same platform) I'm not drawing any firm conclusions. Even so, I have say after the pretty good mpg of the A3, I'm a bit disappointed with the Golf with its cylinder deactivation 1.4 and the promise of more power and better fuel efficiency. Thoughts?