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Static compression ratio is set by piston displacement and combustion chamber volume. It can't be changed without replacing or modifying parts.
However....
Varying the valve timing can vary the effective compression (and expansion) ratios considerably.
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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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