Smallblock efficiency or How to have your cake and eat it too

evil66 said

This might sound like a stupid question but can someone clarify for me which gallon measurement we are talking about,i believe there is one that is bigger than the other. Imperial vs US liquid gallon.
I come from the other side of the world where we use litres and kilometres.

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When I read these threads on mileage, I try to remember to take note of where the poster is located. It is frustrating when there location under there screen name isn’t properly listed. Some fellas I know are in the U.S., some I know ware in Canada or NZ or ....

evil66 said

Thanks for clarifying that. I think i had better keep watching this thread because it looks like i am only getting about 11mpg (US) from my 408 W2 combo. I suppose the 3.9 gears and converter probably dont help too much but im sure it could be improved.
I have bought an afr gauge to try and get it more economical when cruising and am interested in what RAMM has to say about timing and if i should be using vacuum advance when cruising as i currently run an msd dizzy with no vacuum advance.

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Well! Your headed in the right direction with that air fuel gauge. A good & wise move on many fronts. The addition of the vacuum advance will add a few miles to the gallon. The engine will be happier.

What are the sizes of the;

Tires
Cam
Carb
Engine
Stall of the converter?

As these are key/contributing factors.