I am not 100% sure but I think if you go with LPG you can use the earlier motor.
When no one is watching then switch out the LPG stuff for petrol?
Probably not the answer you are looking for though.
You can allways come over to the darkside - our legions are growing
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Cruising in 5th
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Never be afraid to do something new, Remember, Amateurs built the Ark: Professionals built the Titanic.