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Old January 19th, 2011, 04:24 PM   #1
chevyk10
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300 Straight 6 Gas Mileage

Ok so I keep hearing different things about the gas mileage for a 300 six. Most people say they get worse mileage than a 302, but I've also heard a few people say they get great mileage. I had an 89 F250 with a 300 six that got 20 mpg. My 92 F150 only got maybe 13 when I first bought it, but recently did a full tune up and now I get about 16.5 - 19 mpg. Anyone else have issues with the gas mileage?

*Both trucks are fuel injected and have the 5 speed transmission. I have never owned a 300 automatic.

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Old January 19th, 2011, 04:28 PM   #2
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I've got 22 mpg highway with a fresh fuel injected 300 six.
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Old January 19th, 2011, 04:32 PM   #3
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I've got 22 mpg highway with a fresh fuel injected 300 six.
Do you have the manual or auto?

Fuel injection and the 5 speed tranmission make a big difference too. My friends got an 84 F-150 with a 4 speed auto / carb 300 six and gets maybe 12 on a good day.
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Old January 19th, 2011, 04:36 PM   #4
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Do you have the manual or auto?

Fuel injection and the 5 speed tranmission make a big difference too. My friends got an 84 F-150 with a 4 speed auto / carb 300 six and gets maybe 12 on a good day.
It was the 5 speed. I didn't think about that.
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Old January 19th, 2011, 05:16 PM   #5
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I had an 89 5 speed 4.9 Bronco, got 8 on a good day, I could never figure out why. Did cap, rotor, plugs, wires fuel filter, new coolant temp sensor, and drove it like a grandma and still only for 6-8 MPG
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Old January 19th, 2011, 07:28 PM   #6
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Originally Posted by booblinker View Post
I had an 89 5 speed 4.9 Bronco, got 8 on a good day, I could never figure out why. Did cap, rotor, plugs, wires fuel filter, new coolant temp sensor, and drove it like a grandma and still only for 6-8 MPG
U drove 4 miles to work everyday through town and it leaked gas you big dummy.
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Old January 19th, 2011, 09:00 PM   #7
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with my 90 300 six with a 3 speed auto(c6) i got about 6 with k&n air filter, tb spacer, fresh tune up and a fuel filter. it was bullet proof, so i didnt care haha.
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Old January 20th, 2011, 01:15 AM   #8
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U drove 4 miles to work everyday through town and it leaked gas you big dummy.
I put a new tank in it, and did a few 150-200 mile rounds trips after and still got 8 mpg max.
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Old January 20th, 2011, 05:15 AM   #9
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I put a new tank in it, and did a few 150-200 mile rounds trips after and still got 8 mpg max.
Something was definetly wrong with it if you were only getting 8mpg.
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Old January 20th, 2011, 08:16 AM   #10
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i was gettin 16 mpgs city and my 300 6 had 400,000 on it
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Old January 26th, 2011, 09:27 AM   #11
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i get about 18 out of my 96 obd-II when nothing is broken. Currently a small leak in my A.I.R. manifold has dropped it to about 8-10.
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