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I leaned out the idle circuit on mine according to instructions posted by Steve at Rennsport. I seem to be getting much better gas mileage than before and the exhaust is less eye watering. My understanding is that at cruising load on the highway you are still running on the idle circuit so that would have a big effect on the fuel economy.
I have Weber 40s on what I think is a 2.2.
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-Jess
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