« previous next »
Pages: [1]   Go Down

Author Topic: 1987 5.7L V8 fuel economy  (Read 3571 times)

Offline paolotvl

  • Newbie
  • Posts: 16
  • Newbie
1987 5.7L V8 fuel economy
« on: December 20, 2013, 11:17:44 am »
I just put the first miles on my "new" 1987 Custome Deluxe 10 with the 5.7 liter V8 fuel injected. After the first 200 miles without pushing it, I'm getting about 9MPG. Is this normal? The engine seems to be running fine. Thanks for reading.
Logged

Offline zieg85

  • Global Moderator
  • Senior Member
  • ****
  • Posts: 7600
    • 73-87 GM squarebody extended cab and conversions up to 91 R/V series
Re: 1987 5.7L V8 fuel economy
« Reply #1 on: December 20, 2013, 11:40:24 am »
Yikes only 9, I'd say no, you should be 15 minimum, my 454 carb'd gets 13 at least
Logged
Carl 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
https://www.facebook.com/groups/248658382003506/

Offline Irish_Alley

  • Tim
  • Senior Member
  • ****
  • Posts: 13333
  • Family is not an important thing. It's everything.
Re: 1987 5.7L V8 fuel economy
« Reply #2 on: December 20, 2013, 10:42:45 pm »
my 79 k20 with 38's 4.10 gears sm465 and 350 gets 9. make sure your tires are inflated right. keep her under 60 and you  should see a increase. unless your speedo/ odometer is wrong
Logged
If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes

Offline Captkaos

  • OWNER and Administrator
  • Administrator
  • Senior Member
  • *****
  • Posts: 18471
    • http://www.73-87chevytrucks.com
Re: 1987 5.7L V8 fuel economy
« Reply #3 on: December 24, 2013, 11:32:09 am »
what was done to the motor?  It should be getting at least 12-15mpg.
Logged

Offline Stewart G Griffin

  • Senior Member
  • ****
  • Posts: 3324
Re: 1987 5.7L V8 fuel economy
« Reply #4 on: January 01, 2014, 10:29:46 am »
The first thing i would ask is how exactly are you calculating your mpg?
Logged

Offline bake74

  • Senior Member
  • ****
  • Posts: 5871
    • Build Thread
Re: 1987 5.7L V8 fuel economy
« Reply #5 on: January 01, 2014, 10:34:50 am »
Quote from: Stewart G Griffin on January 01, 2014, 10:29:46 am
The first thing i would ask is how exactly are you calculating your mpg?

      Also does it have stock tire size and gears ?
Logged
#1: The easiest and most obvious solution to any problem is 99% of the time correct.
#2: There is no such thing as impossible, it just takes longer.
  74 k10, 77k10    Tom
Pages: [1]   Go Up
« previous next »