Gas additives

What is the difference between heet in a Yellow container and Heet in a red container?

They are two simple but different chemicals. The red container has methyl alcohol while the yellow is filled with isopropyl alcohol. Both chemicals work the same way (allow water to mix with gasoline). The labels should tell you which one is more suitable for your car.

Both the yellow and red containers say the same thing?

Then you may use either one.