"4 gallons of gas over the life of the headlights." from their website."Lifetime and efficiency of halogen bulbsA halogen bulb is often 10 to 20 percent more efficient than an ordinary incandescent bulb of similar voltage, wattage, and life expectancy. Halogen bulbs may also have two to three times as long a lifetime as ordinary bulbs, sometimes also with an improvement in efficiency of up to 10 percent. How much the lifetime and efficiency are improved depends largely on whether a premium fill gas (usually krypton, sometimes xenon) or argon is used." from
http://members.misty.com/don/bulb1.html#hle (*edit wow, i just re-read that, it says the same thing twice. "10% increase in efficiency: and "they are more efficient up to 10 percent")i've had my car with the same headlamps for 3 years now. i am not the first owner but as far as i know they are the factory lights. my car is an 04. (just going to do a bit of speculative math now) if the bulbs were burn right now and i were to replace them with the ecovisions i would expect them to run for a bit under 6 years. a savings of 4 gallons across 6 years? and at the same cost of the factory bulb according to "gm part's direct". not worth it IMO. that's such a nominal amount of fuel to be saved. if it was more significant savings that would be better.
None. Vibe is gone.