I need a motor which is not geared ( I need average speed, but not so much torque, I am building a maze-solving small car ) and on which an encoder can be used. Are out there motors like this? If so, can you share with me a manufacturer, model or whatever?
You'll need to be more detailed. An encoder can be used with literally any motor: it's just a matter of how it's mounted and attached.
If all you want is speed feedback, you can probably do that with an optointerrupter and a "flag" on the motor shaft. Or you can try to do it with back-EMF. There's previous forum thread on the subject here Can I read the back EMF of motors?
It is very rare when one builds a car with a single motor. Also very complicated. Are you sure of what you are building?
I have a 350Z sitting in the driveway. I haven't checked in a while, but I'm pretty sure it only has one motor 
Right! And you did not buy the pieces off the internet and put it together, either.
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Don't be so sure
https://www.reddit.com/r/projectcar/
Sadly, no.
On many of the DC gearmotors, with encoders, the encoder is on the motor. The gearbox can be removed and encoder will not be affected.
@cedarlakeinstruments Just an FYI: many of the intriguing links in that post from 2010 seem to be dead. Also, here's additional discussion of the commutation spike approach to measuring rpm . And here.
But that would be my method of last resort. An encoder or, as you mentioned, an optointerrupter or similar, would be considerably easier.
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