Hi folks 

My mpg readout on the A5 at best says 45mpg on long journeys of 160 miles which i do twice a week and can drop obviously. It doesn't seem to be too bad on fuel so I don't know whether to believe it or not lol. Anyone got any different figures than that. Cheers 

You can easily calculate it for yourself. Fill the tank at the start of a long journey, fill it again at the end, then divide the distance travelled by the number of gallons you put in.

Used to average 40-44mpg, and that was on B8 A4 Allroad with same engine 177PS in efficiency mode (manual 6 speed box). So Quattro will always reduce fuel efficiency. On front wheel drive I’d expect high 40s.

if you’re worried, change fuel filter. Should be done every 20k mikes. You can also run a can of Forte diesel fuel conditioner through it first on a quarter tank, then swap the filter. Mann filters are OE.