When I had my Sierra, with the extra long 5th gear (0.75:1) and extra long diff (4.13:1) and bigger tyres (215/45/17) I was slip streaming a lorry all the way home and got 132 miles out of just over 8 litres of fuel
But even doing 70/80 plus 20 miles of town it did 420 miles on 38 litres so I would love to have that sort of economy again
Although I did also have a 350 bhp twin turbo Sierra at the same time that did, at best, 11mpg and, at worst, 1mpg so swings and roundabouts lol
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