Originally Posted by Paul
Uhhh.... maybe you have a fuel leak...
If you are truely getting only 15 MPGs, then you should be seeing signs of dumping raw fuel out the exhaust... After having the car sit in the same spot while the engine is running... do you have a pattern of black dots being sprayed out of the exhaust? That would be a sure sign of running rich... Also, at 15 MPGs, I'd think you'd be fouling plugs pretty regularly...
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...nope.. No raw gas, no black splatter, no leaks of any kind can I find.. No. 4. plug is a little oil fouled, the rest are dry with a little grey/brown flaky deposits on the electrode. I can't say absolutely the mechanical advance fix was the only culprit, but I will know in about two weeks after I put about 100 miles on the car and top off the tank.