K5 Blazer Gas Mileage

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Thread: K5 Blazer Gas Mileage

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    2.4 Liter SIDI ECOTEC 01IntrigueGX's Avatar
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    K5 Blazer Gas Mileage

    I just sold my 2001 Oldsmobile Intrigue and received our 1989 Chevrolet K5 Blazer as my main vehicle. I am currently getting around 9 miles per gallon in city driving. I am not a lead foot, and I am driving like a grandma to try to improve this. It isn't improving as of yet. I have put in GUMOUT fuel injector cleaner to try to clean the TBI unit, but it hasn't shown any significant improvement. The Blazer only has 36,000 miles, has a Pro-Comp high lift cam, has the 350 V8, 700 R4 transmission with overdrive, and a GM 10-bolt rear axle with posi. Is there anything I can do to improve my gas mileage?

    Much Thanks.
    In the Garage:
    2013 Ford Taurus LIMITED
    2014 Chevrolet Suburban LTZ
    2013 Honda CR-V LX AWD

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    Re: K5 Blazer Gas Mileage

    I would say 10 MPG is probably the norm with a tank like that, Changing the fuel filter and pretty much all the filters may give you a slight improvement but nothing spectacular.

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    2.4 Liter SIDI ECOTEC forsbach427's Avatar
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    Re: K5 Blazer Gas Mileage

    yeah that thing is old so i would say probably 10-12 city and maybe 15 highway only thing i can think of is exhaust and air filter.

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    4.4 Liter Supercharged Northstar bouda's Avatar
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    Re: K5 Blazer Gas Mileage

    Perhaps synthetic fluid in the engine and gear boxes, but that could get spendy and the effects would be marginal I think.

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    Re: K5 Blazer Gas Mileage

    That would be about right MPG, it is winter time and being cooler will make it run richer.
    ASE Certified GM Parts Consultant

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    Re: K5 Blazer Gas Mileage

    That cam isn't helpin you much either. Does it have any exhaust upgrades?

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    6.0 Liter L76 V8 casket_demon's Avatar
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    Re: K5 Blazer Gas Mileage

    Get rid of the 4X4 and buy a samller car, what did U honestly expect from a vehicle that was built when gas was less than 90 cents a gallon. 6000lbs+a gas swilling 350+ a agressive cam+ most likely 3.73's = a lighter wallet 4 U.
    Current line up:
    1987 Buick Regal S/W
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    And further down the road: 2k4 Cadillac CTS V.

    Those gone but not forgotten:
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    --ME--

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    Re: K5 Blazer Gas Mileage

    I agree that the mods are what's killing you. Unfortunately I don't think putting it back to stock would help much. That's what you are going to get with a truck, and an older one at that.

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    Re: K5 Blazer Gas Mileage

    put in a new 02 sensor, I think theyre just off the manfold on the exhaust. A tune up would help if it hasnt been done. Set the timing back to stock.
    Other than that, thats just the way it is. my 88 silverado 4x4 could only go 120 miles or so on 1 tank.

    Thats with all the most of the emissions crap disconnected, K&N open air cleaner, straight dual exhaust with a flowmaster!

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    2.4 Liter SIDI ECOTEC 01IntrigueGX's Avatar
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    Re: K5 Blazer Gas Mileage

    Thanks you guys for all of your tips, however, I would never sell Big Blaze, EVER.
    In the Garage:
    2013 Ford Taurus LIMITED
    2014 Chevrolet Suburban LTZ
    2013 Honda CR-V LX AWD

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    Re: K5 Blazer Gas Mileage

    I managed to increase my 89 burb from 8 to 11.2 with a few easy steps. Syn oil, air pressure,good tune-up and playing with the lights. Of course if it is too bad, I would give your k-5 a good home on the beach in NC :> (Thanks you guys for all of your tips, however, I would never sell Big Blaze, EVER.)

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    2.4 Liter SIDI ECOTEC 01IntrigueGX's Avatar
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    Re: K5 Blazer Gas Mileage

    hey thanx.
    In the Garage:
    2013 Ford Taurus LIMITED
    2014 Chevrolet Suburban LTZ
    2013 Honda CR-V LX AWD

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    Re: K5 Blazer Gas Mileage

    It's just a low MPG vehicle. I have the same power train and aspiration package with a stock cam and it's 4X4. I get 12 MPG.

    You just need to accept that you're low MPG is caused by the high lift cam which has a longer duration and supplies more fuel which is not efficiently burned. Those types of cams are left overs from the high octane rating hi pressure muscle car era.

    The only way to help that thing is to do a TBI overhaul and find a hi flow air filter, change the oil, and do a lube job, especially the U-Joints.

    Pretty basic stuff.

    Try getting a motor cycle for small single person excursions. I wish I had one.

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    Re: K5 Blazer Gas Mileage

    Quote Originally Posted by Sand Buggy View Post
    It's just a low MPG vehicle. I have the same power train and aspiration package with a stock cam and it's 4X4. I get 12 MPG.

    You just need to accept that you're low MPG is caused by the high lift cam which has a longer duration and supplies more fuel which is not efficiently burned. Those types of cams are left overs from the high octane rating hi pressure muscle car era.

    The only way to help that thing is to do a TBI overhaul and find a hi flow air filter, change the oil, and do a lube job, especially the U-Joints.

    Pretty basic stuff.

    Try getting a motor cycle for small single person excursions. I wish I had one.
    The guy was talking about his low mpg about 7 and a half years ago. Truck probably doesn't even exist anymore...

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    4.4 Liter Supercharged Northstar Tomko's Avatar
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    Re: K5 Blazer Gas Mileage

    ...And the award for resuscitating a dead thread, by a first-time poster, goes to:
    Tomko

    Current Fleet:
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