No idea at all Alffie.
I normally only switch on the centre and R/H lights, but had them all on when cleaning the other night.
I havent noticed a "jump" in my power bill that is abnormal to previous years.
I gave George a bath last night after picking him up from wheel alignment. He is now jokingly being reffered to as a trailer queen (except he is dragging the trailer, not sitting on it)
I did about 90kls this morning for a little shake down run.
Here is a short crappy video from iPhone.

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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.