Just to reconfirm what @MickAP said: Those figures you quoted sound about right for a 2 litre NC.
Went out for a drive today and played with the mpg gauge a bit, was getting about 26 -30 around town (traffic wasn’t too bad), on b roads it showed 30-33 and on the motorway at 70 it was showing 36-40mpg.
If I’m driving in town traffic, I can easily see the MPG drop down to 28ish. And the first few miles after a cold start can easily be worse than that. And as you’ve found, 40 mpg is perfectly achievable on a nice clear motorway. Hope you’re enjoying your new car!
Yes, the ND engine is an Atkinson cycle engine, where the expansion ratio is greater than the compression ratio. The expansion ration of 14:1 would probably cause detonation if were also the compression ratio. The exhaust will be cooler as more energy to removed from the gas, so I assume there may be advances in the catalytic converters.
MY23 2L ND here has averaged 40.9 over the latest 9K miles. Mixed driving, but little in cities like London. I don’t thrash it but many drives will have a peak of say 5K rpm a few times. Not the same engine as your NC though.
Driving ”energetically” around Milton Keynes with all our roundabouts I’ll get mid to high 20’s. Driving 20 mile round trips on A roads at 55-60 I’ll get around 35 mpg. Long drives on the motorway at 65-70 I’ll get around 43-44. The very best I’ve seen on one trip was 47mpg.
All these numbers are from brim to brim refuelling as I’ve found the mpg on the dashboard to be a bit pessimistic
These 2 litre engines are not made with economy in mind but I’ve found you can achieve decent numbers if your keep an eye on the right foot
Fwiw re better fuelling/ economy. If you are still concerned it may be a faulty part etc.
I recently changed out both Intake runner control solenoid valves on my 2015 NC3 2.0 sport tech ( easy 10 min job). Since, I have been getting noticeably improved mileage for the same driving style. More interesting, & I am willing to admit this slightly more subjective . Car definitely feels like it is fuelling as it should with noticeably better low torque & pulling away uphill from stationary appears to be less effort.
Personally I don’t understand how to measure mpg if I am measuring from full to half a tank of petrol, unless I poke a measuring stick down into the fuel tank.
The best calculation for me is to fill tank, driving until the fuel light comes on, then refill and calculate litres input to miles driven.
As an easy reference, I get 300 miles on full tank of E10 and 320 miles on E5 fuel. That’s roughly 34-36 miles per gallon. Try it .
Another thought is that the full level indicator drops quicker once is registers under half full. So that, in itself, is indication not to trust the guage until it’s saying full, I’ve covered at least 250 miles from full and that the low level fuel light is on .
. Car definitely feels like it is fuelling as it should with noticeably better low torque & pulling away uphill from stationary appears to be less effort.