diesel v petrol running costs
i have a 330i e93. if i put normal unleaded in it lacks power and sometimes pinks so i always use tesco 99 octane which is about the same price as diesel. im of the opinion that normal unleaded is rubbish and any performance orientated engine should use the more expensive higher octane. now when you compare the cost of this to running a diesel the diesel, if you are running one for the sake of economy, makes far more sense.