You lose half the range before the beam reaches the bullbar
Not nessesarilly, it does spread the beam a lot better so you can see much better to what is coming from the side of the road as well as the mud thing but I have to say, mine do what I want them for
(Ex I-S truckie, 7,000,000 km)
Thats in a truck, unless that was off road then thats a moot point....sorry
What do lights on the roof do for fuel economy?
The same thing as the same amount of lights on the bullbar....
480W load on the alternator would would give pretty fair engine braking on a downward slope, apart from that it's all pose for my money.
Doubt it will have much of an effect on engine braking, maybe hill climbing will be a bit slower though
I'll stick to my pair of bullbar mounted Tauris (100W) thanks
You do that 
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