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.
These tips and tools can help you recoup thousands of dollars if the unthinkable happens.