I need to know what is a good size (gallons) fuel cell is to install
in a track car??.I do not plan to run any enduros.

I used a 12 gal.

How far do you want to go?
What kind of milage does you car make running on the track?
Bet it is not much better than 6-8 MPG.

12 should do you right. Joe is right, a car on the track gets very poor MPG. Take a couple of 5 gallon cans with you.

You don't want to run out.

I am building the car now. It will have a 2.4L six. I have no idea what
the miles per gallon will be. Safe bet seems to be 12 gal.

I know the local race shop won't put anything smaller than a 12 into the -6 cars. You don't always have to run it full to the brim, but you have space to grow for future displacement or enduros.

I run a 15 myself

brant