When it comes to fuel efficiency the answer is all of the above
When it comes to improving the fuel economy for your fleet there is no one answer. What works for one fleet may not be the best answer for another one.
In addition, there is no one technology alone that is going to get you to your mpg goals.
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Source:: http://fleetowner.com/running-green/when-it-comes-fuel-efficiency-answer-all-above
