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73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: paolotvl on December 20, 2013, 11:17:44 am

Title: 1987 5.7L V8 fuel economy
Post by: paolotvl 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.

Title: Re: 1987 5.7L V8 fuel economy
Post by: zieg85 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

Title: Re: 1987 5.7L V8 fuel economy
Post by: Irish_Alley 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

Title: Re: 1987 5.7L V8 fuel economy
Post by: Captkaos on December 24, 2013, 11:32:09 am

what was done to the motor?  It should be getting at least 12-15mpg.

Title: Re: 1987 5.7L V8 fuel economy
Post by: 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?

Title: Re: 1987 5.7L V8 fuel economy
Post by: bake74 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 ?