Welcome on EM.com
If you have 48 mpg then 50 should be rather easy, except if you eco-drive without knowing about it
With :
you'll easily get a 10-20% improvement.
But with cold temperature you may have difficulties to maintain your current scores if you do short and/or city trips. See
http://ecomodder.com/forum/showthrea...cold-5767.html
Don't hesitate to ask questions,
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.