I'd expect quite the opposite, if mainly doing motorway driving and even 70MPH max, I'd expect nearer 50MPG, if you backed off a bit to 60MPH I'd expect nearer 55MPG if the motorway part of your journey is at least 15 miles each way.
I'm basing that on what I can get on my daughter's late 2009 1.4 16V SC and my wife's late 2002 1.4 16v Polo SE.
Cars, especially petrol cars, don't work well in heavy town traffic full stop, even worse if it is going through its warming up phase in town traffic.
i do a 30 miles round trip to work & back everyday i average between 65mph-70mph on the motorway & still get 37mpg car only done 22k coming up to 3yrs old in july this year but moving closer to home in the summer so will be doing less miles a day soon only a 8miles round trip to work so we see what happens. hopefully trading it in soon for a new mk3 leon fr when i start my new job.
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