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Old January 26th, 2019, 12:36 AM
jagarra jagarra is offline
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Join Date: Apr 2014
Location: Reno, NV
Truck: 1962 Custom Wideside SB
Age: 78
Posts: 250
Rep Power: 130
jagarra is on a distinguished road
Default Terrible gas mileage,

I have been tracking the MPG on my truck since i have had it, it has finally settled on about 6.2 MPG, OUCH!!!!

I have a 500 CFM Holley on it, recent tune, valve adjustment, runs like a top just horrid mileage. I have the stock 3.54 gearing and a 420 tranny. The entire fuel system was replaced after I bought it

I did try jetting it smaller than what came with carb, mileage went down to 6.1, so I put the stock jets back in, went up to 6.27. I can go smaller as I bought 2 sets, each going down one notch from stock. I do have a big air cleaner with a paper filter so it is getting a lot of air.

the elevation here is 4450
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