Hello Sparky and welcome on-board.
Do you already use any eco-driving technique ?
You have a complete list of efficient techniques in the
100+ hypermiling / ecodriving tips to increase gas mileage - EcoModder.com document accessible from top of every page.
Do you plan any mod ?
You have a complete list of efficient mods in the
60+ Vehicle modifications for better fuel economy - EcoModder.com document accessible from top of every page.
To begin with, try to inflate your tires near max sidewall and to coast in neutral.
Also create your cars in the garage and fill-up their fuel logs. This is an excellent tool to see how much you improve and to motivate yourself.
Have fun,
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.