Edelbrock 1406 gas mileage

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Well after two tanks, I'm getting 12 with my setup. Kinda weird to me, I thought the 3.73's would help by keeping the engine more in its torque curve. It was getting about 13.8 with the 3.07's. I'm thinking my tank is leaking though. Sometimes when I come home in the moring from work I can smell gas around it. But I have been driving it all week b/c of electrical problems on the S10 and still just getting 12 mpg. Kinda depressing, I was hoping for 14 or so. But I'm not very easy on it either. This is the most powerful engine I've had in it, and its just so much fun!

Oh my setup is 361 (.060 over 350) flat top pistions, 882 heads, summit cam 224/224 @ .050, edel performer rpm, 1406, 700R4 with a 2200 stall (factory on a vette), and 3.73 peg leg running 275/60/15 tires (28" I think)