I'm driving a Dacia Duster with (probably) the same diesel engine and 6-speed auto as your Megane.
Published consumption, combined:
Manual: 4.4 L/100 km (53.4 mpgUS)
Auto: 4.5 L/100 km (52.2 mpgUS)
My result, lifetime: 5.7 L/100 km (41 mpgUS)
-which sucks, but I'm still #2 on Spritmonitor for this vehicle. (#1 looks weird, I think I'm actually #1.) Hilly terrain + lots of highway @ 110 km/h (68 mph) + auto trans is probably why my fuel consumption is so high.
A few weeks ago I raised tire pressure from 30 psi to 45 psi (warm) (max sidewall: 51 psi). First tank indicates a tiny improvement, perhaps 1 mpgUS. Time will tell.
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