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Its theoretical mate - cars in showrooms have none or little petrol they still have a BHP/Tonne ratio in the spec - maybe it should read for the increibly dumb (please add petrol) after the ratio - eh? I have a funny feeling you know what I mean though
add 43kg of petrol then and the ratio becomes
946kg + 43kg = 989kg
1000/989x172 (180) in my case = 182 BHP/tonne !!!!!!!!!!!!! Like I said!