jet engines and oxidizer

[Kerbocracy]

I was wondering - with my spaceplane, after I'm done running my jet engines (at say 17km altitude, 750m/s), I engage my rocket and go into orbit. When I'm orbiting, I realize that the jet engine fuel tanks are carrying a lot of oxidizer. I'm guessing that this is because they don't use it when burning in the atmo. So essentially it's a waste because my rocket engine has the right fuel/oxidizer ratio in its own tank.

Is there any way to a) bring less oxidizer so that when my jets are done burning there is no extra weight in oxidizer going into orbit or dump the oxidizer at that point? It seems like a waste to dump it; I could have carried extra jet fuel instead of oxidizer for the jet engines. It sounds like we might need a jet engine fuel tank that only carries fuel and no oxidizer...

[numerobis]

There are several; the Mk1, Mk2, and Mk3 fuselages, and adapters between them, are exactly what you seek.

[Sirrobert]

The ones that have oxidizer are ROCKET fuel tanks. Jet fuel tanks don't have any oxidizer, only liquid fuel. You probably picked the wrong tank

[Kasuha]

There are rocket fuel tanks and jet engine fuel tanks (except the one which is just fuselage without any fuel).

[Kerbocracy]

There are several; the Mk1, Mk2, and Mk3 fuselages, and adapters between them, are exactly what you seek.

Ok I totally neglected this. Thank you.