78 K5 Gas Mileage

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SquareRoot

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Joined
Mar 18, 2017
Posts
3,659
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6,602
Location
Arizona
First Name
Mike
Truck Year
85
Truck Model
K20
Engine Size
350
I'm getting about 15 mpg in my 85 K20. Yup, another decade or so and the increased mileage will pay for the Pro-flo efi and nv4500 swap. LOL. In the meantime, I just enjoy that it drives like a modern vehicle....and the "cool" factor.
 

GMFORLIFE

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Joined
Feb 19, 2018
Posts
368
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194
Location
Cleveland Ohio
First Name
Dennis
Truck Year
1973
Truck Model
C20 Camper Special
Engine Size
454
I could kick myself...when I was younger I'd throw away the stock air cleaner and bolt on a chrome open element.
Loved flipping the lid on the stock air cleaner and hear the fuel go bye bye!
:D:D:eek:
 

GMFORLIFE

Full Access Member
Joined
Feb 19, 2018
Posts
368
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Location
Cleveland Ohio
First Name
Dennis
Truck Year
1973
Truck Model
C20 Camper Special
Engine Size
454
I already have a 4L60. Unfortunately the roads here don't allow me to get into O/D often.
Tremic is a 6 speed manual..should still improve you fuel mileage.
 

Ricko1966

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Joined
Apr 11, 2017
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Location
kansas
First Name
Rick
Truck Year
1975
Truck Model
c20
Engine Size
350
Okay wheres your timing at? If you aren't timed optimally it will cost you more in mpg than you would believe.Let me know how it was timed,where your vacuum advance is hooked up,and how much centrifugal you have in the distributor.
 

77 K20

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Joined
Nov 9, 2012
Posts
3,075
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3,044
Location
Montana
First Name
Mike
Truck Year
1977
Truck Model
K20 5" lift
Engine Size
HT383 fuel injected
I really liked Austria when work sent me twice. Got to spend 6 weeks in Salzburg and then another 6 weeks in Villach. I'd go back in a heartbeat. Really enjoyed everything there.
 

cstew47

Full Access Member
Joined
Feb 7, 2015
Posts
181
Reaction score
120
Location
colombia
First Name
craig
Truck Year
1978
Truck Model
K5
Engine Size
383
Whooie, I just filled my tank today. I'm up to 6 mpg.
 

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