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RManson · 07-25-2014, 07:03 PM

I got around 14mpg from my 307 with a 4bbl Edelbrock setup. I think it was a 600cfm carb. Went to a Holley Avenger EFI setup and got around 18-20mpg. Those are highway numbers with a T5 trans, 3.83 rear gear, and a 29-inch tire. No cam, Speedway Motors stainless exhaust manifolds. I would estimate power around 200hp, give or take. Hope that helps!

07-25-2014, 07:03 PM	#3
RManson Registered User Join Date: Jun 2011 Location: United States Posts: 159	Re: What can I expect? I got around 14mpg from my 307 with a 4bbl Edelbrock setup. I think it was a 600cfm carb. Went to a Holley Avenger EFI setup and got around 18-20mpg. Those are highway numbers with a T5 trans, 3.83 rear gear, and a 29-inch tire. No cam, Speedway Motors stainless exhaust manifolds. I would estimate power around 200hp, give or take. Hope that helps!