Reply to "How far on a gallon?"

rapierMember

Thanks for the response guys.
The Holley is a new 1850S/4160 with a conversion kit for real secondary jets. I'm running 64 primary and 66 (or was it 68?) secondaries. The new carb replaces an old 700cfm Holley (a 4778-2) - I replaced that because it was getting only 10mpgUK/8.33mpgUS. Ignition timing is correct (Mallory dual point) and there are no obvious leaks or fuel fumes coming from the engine bay. The rolling road guy was happy with the mixture. From reading the other posts here I seem to have the worst fuel consumption for a stock (almost) car. I get 12mpg (10US) on country roads, and 12.9mpg (10.75US woopee!) on a motorway cruise at a steady 70mph.
Could it be the cam? (I have no idea whats in there!) Any other ideas?

9/17/042:01 AM

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