Audi Q7 2015 Owner's Manual page 236

234 Driving and environment
the engine is at its proper operat ing tempera -
ture and fue l economy has reached a norma l
level. So you can see that you sho uld avoid
short tr ips wheneve r possib le.
The outside temperature is also crit ical in t his
regard. Your car consumes more fuel in the
winter than in t he summer .