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In my 11 years old turbo diesel I used only regular and mid-grade during years.
One of the rules to eco-drive is to shift up soon, but it had difficulties to stay at 1500rpm. During the first premium tank I felt changes and now (at 4th tank) it can accelerate from 1200-1300rpm.
Because it permits me to improve my eco-driving style premium permits me to have a better mileage. Currently I'm staying with the premium as while I'm saving 33% of diesel, I'm saving 30% of money. May be one day it will be the placebo effect... My mechanic maintains my car, but premium seams doing things my mechanic doesn't...
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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