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. This 50% off mail-in rebate cuts it to $2.25. (The rebate can also be filled out online here.) After factoring in the rebate, that's $2 below last week's mention and $9 under the lowest shipped price we could find. It purportedly maximizes fuel economy and restores lost power, performance, and acceleration. Deal ends June 30.

Note that up to two bottles can be purchased with this rebate offer.