True MPG: most efficient executive and luxury cars 2019
What Car?'s True MPG tests show what fuel economy you can really expect from a car. Here, we reveal the best and worst-performing executive and luxury cars we've tested...
4. Audi A4 2.0 TDI 190
True MPG 47.8mpg
3. Vauxhall Insignia Grand Sport 1.6 CDTi 110
True MPG 50.2mpg
The bottom step on the podium goes to this 1.6-litre diesel model. Just bear in mind that you have to put up with quite a lot of road noise in all Insignia Grand Sports and rear head room is tight.
2. Vauxhall Insignia Grand Sport 1.6 CDTi 136
True MPG 51.8mpg
In official tests, the CDTi 136 version of the Insignia Grand Sport averages 2.8mpg less than the CDTi 110, but our True MPG figures show that the tables are turned in real-world conditions.