« Reply #5 on: 11 February 2012, 13:49 »
You don't have any hills where you're based do you Krazy? Hills affect economy big time.Lets say 320 miles is a reasonable minimum tankful going from full to when the light comes on for non scientific purposes in mixed driving including hills, cities, motorway etc.
But if you have to go up a hill presumably you have to come back down it [whether it's the same hill or not] so that should even out the consumption
You'd think that wouldn't you, but it doesn't seem to work that way. If I head west from my home which is where the M5 ends in Devon I go across a couple of moors and lots of bendy A roads and eventually end up at Lands End. Average consumption is around 31-32mpg on this run, driving sensibly. If I head North and East towards the Midlands I get around 31-32 until I get past Bristol where it flattens out and then consumption settles around 34-35 mpg right up through the Midlands.
Figures taken from journey average on the computer thingy.

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