I don't know the total coolant volume for that car. Got an owner's manual? It's in there. Probably less than 2 gallons.

When you drain the coolant, it never ALL comes out. Even with the block drain plug... If you make up a 50/50 mix & add that, you end up too weak because of the water that's left in the system when you drain it.

So I do a little math(!) & figure out what's 1/2 of the total coolant volume. After draining/rinsing/draining however many time I want, now what's left in there is just distilled water. I add the anti-freeze, whatever is 1/2 the total volume. Then I add more distilled water & bleed the air out. When I fill the reservoir, I just eyeball a 50/50 mix. After driving a few times that stuff will all become well-mixed.

Try your best to get all the air out of the reservoir & fill to the very top. Then fill the reservoir between min & max. If you leave any air in the radiator, you have to hope it works its way out thru the reservoir.