Try driving at 140mph for a sustained period. You can actually watch the fuel gauge move down the scale as it sucks the juice.
As for 120kmh, thats about 70mph? I don't usually drive that slow, but at a guess about 1/4 to 1/3 of a tank for 2 hours continuous. At 85-90mph for 4 hours I get about 260 miles to 7/8 of a full tank. That's the thick end of £60 for 4 hours entertainment......
<EDIT> Just returned from a 120 mile round trip, averaged 90mph all the way - used less than 1/4 tank.
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