Yup recommended ratio is 1oz techron concentrate additive to 1 gallon gasoline. Probably could (should) reduce dosage if you are using Chevron/Texaco gasoline. If you use the Techron concentrate additive in non-Chevron gasolines, this will have more techron than straight Chevron gas by itself.
32oz bottles of Techron concentrate are available for $13 at Amazon and WalMart.
Yeah the website says unless you're having a sluggish performance issue, you can probably do without the conc if
you're regularly using the Techron fuel. Which makes sense being is that regular low dose of Techron should be keeping things pretty tightie inside.
As a side mention, I coulda swore that years ago I read that Chevron was the go to fuel for OE's on their EPA test rigs???.. maybe it's one of those urban myth things, so don't quote me on that.