
Mt. Hood and basalt rocks in the background--the sign is definitely overkill--but you get the idea.

Mt. Hood and basalt rocks in the background--the sign is definitely overkill--but you get the idea.
We can estimate the annual greenhouse gas savings from a Prius vs a Toyota Matrix, FWD, automatic. The Prius gets an EPA-rated 55 mpg, vs 31 mpg for the Matrix. Assuming 12,000 miles annually, it will save 169 gallons of gasoline per year. Since each gallon produces 11.1 kg of CO2-equivalent GHG emissions, the Prius saves 1,875 kg of CO2-equivalent annually.
I would guess each bulb can save you about 85W (100W-15W), so 15 will save you 1275W. If the lights are on 2400 h/yr (6.6h/day), they will save 3,060 kWh. Using a national average of 1.35 pounds of CO2 per kWh, this will save 4131 lb or 1,875 kg of CO2. So it doesn't seem like an unreasonable statement that the two are comparable.
I am still not convinced that Hybrids are viable products. The production of a Hybrid vehicle requires the same, if not more, energy to produce and we all know (I hope we all know) that the production of any automobile is a very environmentally harmful process requiring already limited resources and energy.
I still contend that car pooling, mass transit, or riding a bicycle is better than purchasing a Hybrid, however for those of us who have to commute by automobile, a hybrid is one way to curb our dependence on foreign fuel and to curb our release of CO2 into the atmosphere.
Here are the remains of my Sony 512MB Pen Drive. It lasted me just over 2 years when it finally shit the bed on me last week.