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Welcome aboard.
In my experience, K&N air filters pass too much dirt through the engine (I live on a dirt road), and make no difference in fuel economy.
And also in my experience, mufflers make no noticeable difference in fuel economy.
Same goes for fuel additives.
The things that make the biggest difference in fuel economy are adjustments to the commuting route, and adjustments to "the nut behind the steering wheel".
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Fuel economy is nice, but sometimes I just gotta put the spurs to my pony! 
Quote:
Originally Posted by thatguitarguy
Just 'cuz you can't do it, don't mean it can't be done...
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Quote:
Originally Posted by elhigh
The presence of traffic is the single most complicating factor of hypermiling. I know what I'm going to do, it's contending with whatever the hell all these other people are going to do that makes things hard.
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