Fuel consumption - partner2002
1. What you can do: Think of your tachometer as a watt-meter.
2. What other people can do: if drivers of "white vans" observed their proper speed limits, there might be more fuel to go round.
Fuel consumption - Dynamic Dave
Or simply not worry about it and enjoy yourself.

Whenever I've tried to squeeze another 2 or 3 mpg out of any vehicle it makes for the dullest of journeys.
Fuel consumption - DP
it makes for the dullest of journeys.


Or in my case, I'll be doing really well, and seeing a visible difference on the rate of gauge falling, only to lose it in a moment of rage or boredom, floor it, take the engine round to the red a couple of times, and completely undo all my hard work in a moment of madness.

I tried to get 40 mpg average from a tank in the Volvo once. I failed (by 1.2 mpg). I will never bother again. It was hell.
Fuel consumption - Old Navy
I suspect that a weeks mimsing around can be written off by a good slip road acceleration. Go for smooth keeping up with the flow, the pennys you may save by mimsing are not worth the bother.