For in-store pickup only and with stock varying by ZIP code, Advance Auto Parts offers the Chevron Techron Concentrate Plus Complete Fuel System Cleaner 12-oz. Bottle
, model no. 67740, for $4.49
Amazon has it for the same with free shipping for Prime members.
) That's $11 under the lowest shipped price we could find. (For further comparison, we saw a 6-pack for $26 last October.)