I like to drive fairly hard, so I'm not surprised at my mileage. Its still got great highway mileage. I have been able to do 350 to a tank highway miles.
I decided not to do the relays. since I read that you must disable the exterior lamp out warning indicator.
Plus with the light output of these babies with 55w h4 and 55w h3 for the fogs is more than plenty.
With my old lights I had some 80w bulbs and they were fine, but I took them out to be safe.
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.