My best tank was 66 real mpg (i suspect a problem with the pump there) but the last 5 tanks were around or slightly above 60 mpg. See my fuel log
Have to say, I do drive very moderately. Mostly motorways following the semis at 85 - 90 km/h (55 mph). At sea level, it happens to be quite flat around here.
A trip to Germany's mountains revealed that although fighting the grades is generally bad for FE, the altitude helps greatly. I got my best economy until then.
I almost always keep it in eco mode and I do use CC when I can.
I also reset my B counter at every cold start and compare the FE to my target consumption of 3.8 l/100 km.
If the MID says 6.0 l/100 km at 5 km into the trip I know I'm (6.0 - 3.8 ) l * 5 / 100 = 110 CC over my target.
At 10km it says 4.7 so that's just 90 CC over. Continuing on I see the number dwindle and hopefully get below zero, if conditions are good.
I'm trying to work out how to factor speed and ambient temp into the equasion to get a better understanding of how well I'm doing.
There is a penalty for accelerating fast; sorry to say but what I see is that for best economy you have to keep the RPM as low as you can live with.
I do accelerate fast occasionally - negotiating a busy T junction - but it carries a 10 to 20 CC penalty compared to a gentle 1500 RPM acceleration.
When nobody is around and the engine is warm I keep RPM at the absolute minimum - 1100 RPM below 55 KM/h, from there it rises in conjunction with the speed) and see my trip l/100 km reading drop even while accelerating.
Already have 910 km on this tank, projected remaining range is 0 km for the last 30 km or so. Fuel warning went on yesterday morning at roughly 830 km into the tank. I should be able to do another 50 km on this tank, but won't try. Not this time. Not yet.