In my insight the current setup effects mpg by .2 Use to the DRLs alone was 2 mpg. I replaced all the bulbs with leds but the turn signals and just removed the DRL fuse. The head lamps were HIDS, 35 watts 4300k low 50 watts 3000k high. Then the fog lamps are 3000k 35 watts all with relay kits. I use to drive 18 miles a day with high beams in the dark alone back roads. Previous with halogen bulbs the cabin started to get warm near the end of that stretch of my commute.
I since went to eco bulbs for high beams. Seems to be same brightness as the oem ones and when driven 9 miles continious it doesnt heat up the cabin like before. I use those now to flash for people to merge in front of me.
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