I installed the 3.68's a couple months ago (June 15th) at 18,500 miles. Since theh, I drove to the Summit (1900 miles round trip), but other wise commute driving. I now have 21,500 on the vehicle and I have noticed a slight improvement in mpg (about 0.3-0.5 mpg) and the FJ seems to start easier.How do you guys with the 3.68's like them so far? I've seen both great and terrible reviews out there. PROBABLY because people were using the wrong short plugs...
If it's time to change the plugs in your FJ, the E3.68 will not disappoint you. IMHO. I purchased the plugs on-line from Amazon dot com.