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Your last 10 tanks are since 2010-10-13 while the 10 previous one were from 2010-04-19 to 2010-10-01, ie automn-winter vs spring-summer, so the 2.8% improvement is certainly lowered by lowered temps.
Do you feel the car behavior different ?
I know that with the rear wheel skirts my car accelerates stronger and is more difficult to keep at a steady speed, as it want to accelerate rather easily...
Denis.
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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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