I plan to try Lucas Fuel Treatment as well. So far the Sta-Bil seems to work fine in the 07 GT. I use it because it is stored for the winter. I forgot to fill up the tank before the roads were salted, so I'm waiting it out with 1/2 tank of gas and a bottle of Sta-Bil.

 

I'll check the plugs after I run out this tank and see what they look like. I threw the other bottle of STP in the trash, heheh, wont do that again.

Thanks for all the input.