OK this make sound stupid but i was woundering if theres a way i can disconnect my secondaries but still be able to hook them up when i need to
As i am still a student at school making no money i would rather drive my car with less power than not at all
Thanks

 

Sure... Don't use full throttle! You can feel a kind of "hard spot" in the pedal about halfway down, that's when the secondaries start to open. If you never push through that, they will never open.

 

The secondaries are vacuum operated. What that means for you, is that, like PeeJay says, they'll only open when you give it lots-o-gas. Trying to accelerate to 60 as fast as possible will make them open. Going up hill will cause a load on the engine, and they'll open. But if you drive conservatively, not forcing the engine to accelerate by mashing the pedal when you don't need to, then your MPG will be the best you can get.
Disconnecting them for a road trip or such, will be a hazard for you. You will be used to driving a car that you are familiar with how fast you can get out of the way of a truck at freeway speeds. When that truck driver does'nt see you, and decides he's moving over, weather you are or not, well...That's a bad time to realize that you disconnected your secondaries as you're flooring it trying to get out of the way!
Driving around town/city, there's not much you can do. Your gas is'nt guzzled by your secondaries in stop and go drive. Engines are just very much more efficient when kept at a constant RPM with a constant load. (In other words, trying to maintain a constant 3000 RPM while driving in the city won't work, either- you'll just burn your clutch at every light!)