Originally Posted by hrcollinsjr
I can only think of a few responses to 15mpg. Your engine is in really bad condition, a sad state of tune (that will probably shorten the engine life), really horrible driving conditions, the brakes are dragging, or you don't know there is a throttle position between idle and WFO. 
Harold
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I'm saving the WOT for after I get an exhaust the doesn't scream "Hey Fuzz, I'm over here!
You'll see I found the mechanical advance was bad. Now that I have it working, I can get the car to idle smooth and stable at 700RPM without issue. I think replacing the sloppy rotor made a big difference there too. I have good vacuum. I would check compression, but I can't find the hose portion of my gauge.
I still need to adjust my clutch. After I replaced transmissions a while back, I never adjusted the clutch fork. The pretty red light keeps yelling at me!