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Does anyone know why petrol prices in Dover are so high compared to the rest of the area, here's the prices in Dover; 
5 cheapest stations Dover for Unleaded...
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Station  : Tesco Dover
Address  : Honeywood Road, Whitfield, Dover, CT16 3EH
Brand    : Tesco
Distance : 1.7
Price    : 87.9p
Updated  : 19-01-2009
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Station  : Priory Service Station
Address  : Folkestone Road, Dover, CT17 9RU
Brand    : Bp
Distance : 0.75
Price    : 88.9p
Updated  : 19-01-2009
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Station  : Buckland Mill Service Station
Address  : Crabble Hill, Dover, CT17 0RZ
Brand    : Esso
Distance : 0.86
Price    : 88.9p
Updated  : 19-01-2009
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Station  : Dover South Services
Address  : Limekiln Street, Dover, CT17 9JR
Brand    : Bp
Distance : 1
Price    : 88.9p
Updated  : 19-01-2009
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Station  : Townwall Service Station
Address  : Townwall Street, Dover, CT16 1JR
Brand    : Bp
Distance : 1.36
Price    : 88.9p
Updated  : 19-01-2009
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Here for example is the price for Unleaded in Canterbury;
Asda Canterbury  	                Canterbury  	0.44 miles	83.9p	
Esso 	Wincheap Service Station 	Canterbury 	1.97 miles	83.9p	
Morrisons 	Morrisons Canterbury Canterbury 	2.4 miles	83.9p	
Esso 	Lakeside Service Station 	Canterbury 	0.57 miles	84.9p	
Total Tcs Kingsmead 	                Canterbury 	0.84 miles	85.9p
Considering we live in an area of lowish income and are designated a (in need of) growth area, why do we get such high prices??