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post #3 of (permalink) Old 9th May 2007
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I suspect the only way you'll get 38mpg out of a petrol Espace is to do mostly motorway miles and stick to around 50mph. The figure sounds realistic for the diesel, but way too economical for the petrol.

If, when you say 'biodiesel' you mean 'cooking oil from Morrisons' then none of the modern common rail diesels like to run at high concentrations of the stuff. We've had reports of a 50/50 mix of diesel/veg oil being okay, but running it on anything other than normal, full strength DERV carries at least some risk of damage. Ultimately, it'd be your car and your gamble.

If you mean proper pump 'biodiesel' then you'd probably be okay. Though I'd investigate further before using the stuff.
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