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Old 10-20-2012, 10:24 AM
Valdez352 Valdez352 is offline
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How do I get better mpg for my 79 f150 302

I have a 79 f150 with a stock 302 I get 8-9 mpg what can I do to get better mpg what upgrades?.
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Old 10-20-2012, 11:01 AM
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It depends some on how you drive it and what it's used for. What transmission and rear gear ratio. I get between 12 to 14 with my 73 F-100 , 2 wheel drive. It's got the 302 , 2bl carb ,3 speed transmission and rear gears are 3:25. You having a F -150 , a lot of them had 3:50 rear gears if they a 2 wheel drive. You should get about the same as i get i believe. If it's a 4x4 then i don't know. I should be getting better than what i do.
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Old 10-20-2012, 11:21 AM
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2x... a rear gear of 2.80 or 3.00 will stretch the MPGs. That and a well tuned engine and the driving habits of a nun.
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Old 10-20-2012, 11:57 AM
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I routinely get 14.5 mpg with mixed driving. That's coming from an 81 4x4 f250 with the 302, zf5 and 4:10s. Sounds to me like you just need to get your 302 properly tuned.
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Old 10-20-2012, 12:01 PM
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dont drive it
lol
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Old 10-20-2012, 06:46 PM
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Fuel mileage

With my 75 F-100 w/ 360, my pops use to say it got 8-10 gallons per mile whe he had it! And it would pass everything but a gas station!
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Old 10-21-2012, 05:51 PM
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If I put 3.00 gears in the rear what gears should I put in the front to balance it out my f150 is 4wd with 6 inch lift and 36's
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Old 10-21-2012, 06:48 PM
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Quote:
Originally Posted by Valdez352 View Post
If I put 3.00 gears in the rear what gears should I put in the front to balance it out my f150 is 4wd with 6 inch lift and 36's
You need to put the same ratio in front and back. 3.00 gears with 36 inch tires and a 302? Honestly, with that combo your truck wont be able to get out of its own way. If you want your mpg to come up, you need to dump the rotating mass of those tires. Maybe 32/33 inch tires, but with a 6 inch lift you might not like the stance of the truck. Another thing to keep in mind theres no aerodynamic qualities on our rigs. They are what they are. My combo is 351M with 33 tires and 353 gears. I get 8 around town, and 12 on the highway if I keep it about 60
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Old 10-21-2012, 11:31 PM
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Quote:
Originally Posted by Valdez352 View Post
my f150 is 4wd with 6 inch lift and 36's
That might have been good to mention in the original description of your truck... No wonder your getting poor mileage, your running 36s. Your driving a lifted truck from the 70s with over size tires, your going to get terrible mileage no matter what you do. With 36s you might be better off going with a lower gear ratio so the engine doesn't have to work so hard. 4:56s would probably be your best bet, you could probably get by with 4:10s. I don't know what your ratio is right now.
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Old 10-21-2012, 11:49 PM
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ya you probably have 3:50 stock and 36's are to much. 33's are about max with that kind of gearing. 4:10's would be much better for 36's
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Old 10-22-2012, 04:50 PM
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Ok so 4:10 would be the best gear ratio for the lift and tires what about a new cam what do you think the best to buy would be?
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Old 10-22-2012, 05:35 PM
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Ok so 4:10 would be the best gear ratio for the lift and tires what about a new cam what do you think the best to buy would be?
Check these out, i have their level 3 in my 390, sounds great and hauls butt
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Old 10-22-2012, 05:35 PM
 
 
 
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