Well, although counter-intuitive, if you accelerate really fast and reach top gear at the earliest AND THEN maintain minimum RPM for that speed, you will get better mileage - the reason is that you spend less time in lower gears (and consequently relatively higher RPM). It is not the gear or vehicle speed that wastes fuel - it is the RPM at a given vehicle velocity: Lowest RPM for highest speed = best mileage, and this is something only the highest gear(s) can give - viz., 4th and above. So get to highest gear as soon as possible and try to keep vehicle in highest gear with minimal accelerator push - then see the mileage you get.
Anyways, I suggested looking at the tacho simply because I thought you might not know the shift-point speeds. If you know at what speed to change gears then that is the better way of doing it, otherwise use the tacho.
S = k.I^2, where S is the amount of stupidity a species possesses, I is the intelligence the species has and k is the universal constant of stupidity.
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