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When trying to conserve fuel you should use the acceleration that uses the least amount of gas or said another way accelerate the way that gives you the best MPG.
The length of time that you are accelerating is not a factor in MPG. It's the distance that you can travel with a given amount of gas that determines MPG.
Example.
Lets say you are accelerating up an on ramp that is 660 feet long (1/8 of a mile). If you tromp on the gas and your MPG meter says you are getting 4 MPG then by the end of the ramp you have used 4 ounces of gas.
Using the same ramp if you accelerate as if you have the "egg" under your pedal and your MPG meter states you are getting 12 MPG then by the end of the ramp you will have used 1.33 ounce of gas.
What we all need to figure out is what gear to use and how much acceleration will give the best MPG. In many cases it is a matter of compromise between MPG and getting on the highway without getting run over.
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