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The US gallon is 3.8 litres while the imperial gallon is 4.5 litres (both figures rounded). This is a significant difference and accounts for some of the gas guzzling reputation of American vehicles, their gallon is smaller which, to the casual observer, exagerates the fuel consumption when seen through British/Irish eyes.i had a loan of a golf 2.0 for 2 weeks when my sister was on her honymoon and i averaged 63 mpg.
your gallon i think is different than ours .
my volvo b12 when the wind is behind its 18 tons fully laden will do 14mpg on cruise control 53 mph at 1100 revs is the sweet spot --i can get better on my own as the cruise control pushes it up a hill like diesel is free --i dont and can get sometimes 15 mpg .
for a 12 liter 18 tonner thats good .
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