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A vehical that runs on petrol and diesel is impossible as they are both ignited in different ways. For exaple petrol is ignited by the spark plugs and a diesel is ignited by the shear force of the compression from the pistons.

A petrol engine has a round 9:1 compression ratio and a diesel has about 20:1 but these veary from engine to engine

I hope that hasn't lost you

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