Guys,

A taxi driver told me once to install a pilot jet on my carburetor to decrease my van's fuel-consumption. I'm interested but somehow skeptic, I would want to solicit the following info from you guys:

1. how it works
2. what are the real benefits
3. negative effects
4. how would i know if the mechanic is good in doing this
5. estimate cost

Please guys, i really need your inputs. My dad has already decided to push through with it this coming weekend and I would want him see for himself first what experts has to say about it. Thanks