and and l found this one that said some about the gas( it said it had a 14.5 gallon main unleaded fuel tank. what does that mean...are scion tc is usually bad on gas???

The tank holds 14.5gal of fuel.

This just means that the gas tank holds 14 and a half gallons of gas. This does not have anything to do with the gas mileage, which would be somewhere in the mid 20 is l believe. This is an average sized gas tank. l believe the word ''main'' refers to it being the usual gas tank, but there is also a small 1-3 gallon ''reserve'' tank on most cars that is only used when the main tank runs out.
Good Luck, Scion tC is are a great choice.

What is considered ''bad'' on gas?

It is all relative.

On a full tank of gas (topped off), l get well over 400 miles. l drive a manual transmission 07 TC. It is great. l love it. l think, relatively speaking, it is great on gas.

No and that is how big tank is.

That is how big the tank of the tc is for holding gas (petrol) and it has nothing to do with gas milage.i own a 08 tc the gas millage is about 21-23 local so its not really a millage car

It just means that it has a 14 and a half gas tank. That is how much the gas tank can hold.
My 07 tc is great on gas, l see people saying that there getting about 20-25 MPG. l think that there nuts. l drive city all the time and get about 28-30 MPG. l think that as long as you dont drive the TC like there is no tomorrow, then you should get good gas milage.

the fuel tank can hold 14.5 gallons of gas.