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302 Fuel Mileage??

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Old 05-25-2010, 02:33 AM
alconk alconk is offline
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302 Fuel Mileage??

Ok I've been reading a few post about there mileage being down on the 360/390 of around 10-12 mpg. Well I have a 302 in my 79 sb with a Edel. 600, headers and dual exhaust. Nothing else, stock rear gear (3.25) stock size tires and no emissionns. I get between 11-12.5 and that's on the highway and I baby it. It's all tuned up, no sticking rear drums so what gives for a measly 302. Why such crapy mileage?
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Old 05-25-2010, 07:57 AM
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I get 20mpg on highway on all stock 302/carby/exhaust in all standard truck, long bed.
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Old 05-25-2010, 09:07 AM
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If you've ripped out EGR, it will account for some mileage loss. Also, a 4-barrel is more efficient in theory, but it does need to be carefully tuned to realize better mileage (not saying you haven't already). Given the factors, it's not surprising to me that people with completely stock trucks are realizing better mileage. Also, "babying it" is really hard to define.
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Old 05-25-2010, 10:41 AM
Shane in WI Shane in WI is offline
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My 77 F100 2wd Explorer, 302, 3-speed, 3:00 open rear, headers, was getting 6 and 8 mpg last fall. This spring I installed a new gas tank and rebuilt the 2 barrel carb and just checked my second tank last night and got 9.6 mpg. I have not gotten the carb fine tuned, but everything else is working properly. I'm alittle disappointed with the mileage as well. But 10 is better than 6. I would have expected 12 to 14. But I've been on all short trips, no highway miles.
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Old 05-25-2010, 11:59 AM
alconk alconk is offline
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Quote:
Originally Posted by fmc400 View Post
If you've ripped out EGR, it will account for some mileage loss. Also, a 4-barrel is more efficient in theory, but it does need to be carefully tuned to realize better mileage (not saying you haven't already). Given the factors, it's not surprising to me that people with completely stock trucks are realizing better mileage. Also, "babying it" is really hard to define.
What I mean by baby it is no aggressive starts, no getting into the secondaries. I did however play with the jets in the carb and was loving the extra power but could not afford the fuel loss because it would go fast, so I put everything back to the "economy" setup. And ya the egr has been long gone.
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Old 05-25-2010, 12:14 PM
jeddi03 jeddi03 is offline
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I have a 1977 f-100 stepside with a 302, headers, holley 500 cfm 2 barrel, no egr, and I get 23 - 24 highway. The gearing is stock and i am rolling at 3000 rpm at 65 mph. looking to change the ring and pinon to get the revs down to 2500 - 2600 at highway speeds to help with the economy.
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Old 05-25-2010, 12:29 PM
Shane in WI Shane in WI is offline
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My truck has the egr and charcoal canister hooked up, but little else for emissions. No PS,PB, or AC options. Going to get some help fine tuning the carb and see. Runs and sounds pretty good as is. Seems it should be doing better the way it's set up.
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Old 05-25-2010, 02:25 PM
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I get 11 around town, 15 or so on the highway. Originally it was 2.75 gears. Now it has 3.50's. There was no change in mileage and the 302 is much happier spinning down the highway than lugging. I have all the emmisions, but have the timing advanced, some slightly larger jets in the 2150, a high flow cat and a Flowmaster.
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Old 12-30-2016, 06:55 PM
Kingsanchezz Kingsanchezz is offline
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How bad with 4x4
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Old 12-31-2016, 04:16 AM
barnym17 barnym17 is offline
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Hate to tell ya but the edelbrock is the problem, they have a rich fuel calibration stock.They are designed this way purposely to prevent customers from melting engines due to being to lean.A rich mixture covers a multitude of sins drivability wise. It can be tuned however, there is a lot of info out there about this so I wont give specifics just say mainly get the main metering circuit as lean as possible without lean surge and fatten up the power circuit to compensate under load.
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Old 12-31-2016, 04:19 AM
barnym17 barnym17 is offline
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A much better carb option would be a 4180 holley as installed by ford on mid to late 80's trucks and cars,It was an emission carb with much more precise fuel metering and economy designed in.
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