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With our Q30 1.6 t DCT with800 miles on the clok, over a 300 miles trip composed of 40 miles of higways (speed limit 55 mph) and the rest motorway (speed limit 80 mph), we achieved 36 mpg.
 

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The beauty of these Benz engines is to have the maximum torque at as low as 1250 rpm (in the case of the 1.6 t), that was a decisive factor and I’m not disappointed, it is definitely responsive and peppy, and I’m talking gearbox in Eco mode, with the Sport mode it is almost too much.
 

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Had my 2.2 automatic for just over a month and covered 1500 miles. Averaging around 48mpg, but that does include some longer runs.

That will do me for a 2.2, auto and AWD :)
 

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On the first two fill ups 55.24mpg with a 1.5d
The engine is now feeling much looser so I reckon this will improve ;-)
55 mpg is a very good performance but it’s to be expected from the good old Renault-Nissan K9K engine which has powered countless Renault and Nissan cars as well as Benz’s and of course lately Infiniti’s. I had it on a Nissan Note in its 90 hp version and my daughter has it on her Benz A Class in its 109 hp version (same as the Q30) and I was, and she is, indeed very happy with it.
 

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Hello, I'm doing about 42 UK mpg in ECO on motorway and dual carriageway. 35 UK mpg normal combined driving, 30 UK mpg having fun in sport mode. I am pretty happy with this as I expected worse. Q30S 2.0t DCT petrol with 7k miles.
 

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Update, now on 10.5K miles. Went to Cardiff and back from Cornwall on E10 got 40 mpg and including when I got confused in Cardiff for an hour in stop start traffic on the one way system as the council closed a few roads to my carpark location 🤗. Very happy with the MPG as Holly my Q30 is no slouch 🍺
 
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