Well I finally did it, got a dream run with the traffic lights, very few cars on the road and over 223km I used only 10.5L of gas, which is 4.7L/100 or the good old 50mpg mark
I doubt I can improve very much on this tho' as I was EOC from 35mph to a dead stop at lights and using super granny acceleration techniques.
It's SO strange seeing people brutally accelerate to overtake me when a red light is only 1/6 of a mile away. They get there 10 secs before I coast up. Just seems so futile...
I'm looking forward to finishing building my MPGuino so I can get accurate long term mileage figures posted.