If the emissions are ok, its likely the idle mixture is fine, but you do need a proper gas analyser to check it properly without O2 feedback. I have an old gunson gas tester, but am unsure if it still works properly, it was always pretty ropey anyway. You could fit a wideband O2 and gauge, or just the O2 sensor and feed it to a gauge for testing, it would need a bung welded into the exhaust.
If your mpg is so low and idle is fine, then its possible you have a bad AFM, but I'm not sure what type of system you are running.
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