While watching images of yet another war on the TV over the weekend, BBC news gave a list of things you can do to increase your MPG in your car, with petrol prices nudging £1.45 for diesel.

One of their suggestions was to keep lights switched off until dusk! Now, some of you smug buggers have new Xenons with LEDs, but for those of us with the equally fantastic older Xenons (warts and all), it really would be amusing to know just how much MPG we do lose with the Xenons on all the time!
It could be
absolutely nothing at all, but I would imagine that Xenons use a bit of juice to be powered on, probably more than a halogen. I just don't know.

And for the record, I really couldn't give a stuff about this sort of eco driving - it's just an interesting question.

I wonder, do the
Bluemotion cars fitted with Xenons (if possible) have the DRLs switched off?! That would be the giveaway ...