I just recently pulled my plugs and gapped them out to .055. I put a new cap and rotor on. And the plugs and wires are only a few months old. I also put a new motorcraft coil on. Earlier on I had advanced the timing to 12.5. This was when it was colder outside. The power and mileage gains from just that were immediate. I guess I gained some power and mileage from the bigger spark gap. But, even before gapping out the plugs, my mileage has been going down steadily as it warms up outside. And it is pinging every so once in awhile, but not very often. So, my question is would this be the timing or the spark plug gap? What kind of problems would a wider spark plug gap cause? Doesn't seem to be misfiring. But, I think there is a very small amount of detonation going on. My other question is the bigger spark gap going to ruin my new coil and cap and rotor by stressing it to much? The other thing is when I did the timing at first and I have never touched the timing before, it was set at 8 degrees BTDC. I don't think the shop touched the timing either. So, 8 degrees might really be 10 degrees, which means it might be at 14.5 degrees right now. Just a thought. So, I might back down to 11.5 to be safe, which if the balancer is off, that would be 13.5.