What mileage does your slant six powered ride get?

'72 Swinger w/ A/C, 8.75 rear, 3.55SG, stock converter, 235/60r14's, 9.3:1 CR, 276/.490 DC cam, Holley 2245 2bbl, 6-1 header & 2.5" exh. , Combined MPG was 18.

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