In my groar's lighting thread - EcoRenovator on EcoRenovator ( Ecofriendly DIY Home Projects) I have a spreadsheet to calculate my savings with all my bulb updates.
Don't hesitate to ask questions there,
Denis.
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Save money & CO2 at home : http://ecorenovator.org/ 
Created and managed by the creators of http://ecomodder.com/ 
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Earth and health are priceless, so are kilotank and AT-PZEV
Best Mégane tank: 1268.9mi @ 77.847 MPG(US)
2008/06-2011/10 saving: - 5725.5 kg CO2 (5342.6+382.9)
- Diesel / Money: 42.17% = 2446.25€ = 3357.26$
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megane : thread - kill switch.
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