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I think changing the carburettor model from 1 barrel to 2 barrels would give some improvement in mpg.
Primary venturi could be small size as it it used mainly for cruising
Secondary venturi could be much bigger giving you power for the occasional accelerations.
My accelerator pump is not working, and it's not needed, because I have quite small primary venturi on my carburetor.
Smaller venturi atomizes fuel better on lower rpm.
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