Andrew is getting 25MPG on a run and Dick used to get a bit better on a continental trip in the same car. 410 with overdrive, Edelbrock carb and standard distributor.
It wouldn't be too much of a reach to hope for 30MPG or more if driven carefully with a Sniper EFI and Hyperspark distributor.
I'm still waiting to get my car back with overdrive. If that goes as well as hoped I will fit Sniper, Hyperspark and SLJ headers. Very much hoping to report with real world figures early next year.
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