My 2.5 V6 mondeo (its a big car) most cars above 2.0litre 2000cc are large cars in the UK but i get 38MPG out of it if i drive it right 29MPG around town.
Most economical car ive had renault megane diesel 1.5litre 74MPG (diesel is around 4p a litre more than petrol)
The average car will do roughly 44MPG
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