Advance Auto Parts offers the Chevron Techron 20-oz. Complete Fuel System Cleaner, model no. 65740, for $7.99. (Amazon charges the same with free shipping for Prime members.) This $5 mail-in rebate drops it to $2.99. (It's the rebate listed at the top of the page.) Choose in-store pickup to avoid the $9.99 shipping fee. That's a buck below our April mention and the lowest price we've seen. (It's the best deal now by $6.) It's designed for carbureted or fuel-injected spark ignition engines. Rebate ends December 31.
Note that the rebate is valid on up to two bottles.
Is it better to get a tax deduction now, or tax-free income later? There's a simple answer.