the faster you go, the more wind resistance you have. I beleive this is an exponential relationship as is the realtionship between accerleation, force and mass.
if you want to drive in the sweet spot, get a dyno run done at partial throttle so you can see where the engine is at its most efficient and select the gear that keeps the engine in that range.
there area lot of tips on the web about saving fuel, keep your tyre pressures up, keep the car well maintained. keep the weight of the car down, dont carry unneccesary items. Check the difference in MPG between regular and premium then factor in the cost difference and work out which is better (if you have an old car with a distributor, advance the timing half a degree on premium and see how it goes)
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