I am not too good as seen in my fuel logs.
In the A2, I feel more comfortable from 30 to 50 mph, anything in 5th really.
The Megane on the other hand is better above 60 mph but also can be quite good in town at 30mph where it seems to be gliding for ever.
Check your brake drag.
The Megane from 2003 is apparently really good in this respect, this is what is said inside Renault at least.
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