Question about 1997 Chevrolet Blazer

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A guy told the wife that we could make our1997 4.3 4x4 blazers gas mileage go from 15 to 25- 30 mpg by disconecting the 4x4,he even showed her where,but shes a true blonde and forgot,all she knows is that it was under the hood,it sounds like a vacuum line or a pump,is this really possible,if so where would this be,or do you think this guy was just trying to get his hands under the old-ladys HOOD?

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  • yadayada
    yadayada May 28, 2010

    he is full of it.

  • wskssmy May 29, 2010

    I figured that he was full of it,because if your going to get 10 to 15 more miles per gallon then everybody would be disconeting there 4wl.drives every summer,he got the old-lady all excited, he probaly was trying to see if she had a hubby(ME) some people are dog's,hopefully we'll run into him again and i'll have him show me what to do and i'll tell him an expert said he's full of it!!!maybe i'll even disconect his vacuum line,especially if he doesn't show me anything,because now the wife just said the guy said your husband should know what to do,thank you,glad you responded so quick AND the wife totally understood your explaination

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Disconnecting the 4x4 will lead to a small improvement but not as dramatic as has been suggested. All that is achieved using the idea mentioned is to prevent the driver from selecting 4WD.

It won't make any greater difference than by just leaving the vehicle in 2WD via the usual transmission controls: you'll still have the additional mechanical weight to lug around, the additional frictional and aerodynamic drag of the unused mechanism and on some surfaces the inability to engage 4WD will actually increase fuel consumption.

Total removal of the additional components to permanently convert to 2WD plus smaller wheels and tyres, a smaller capacity engine and a lowered suspension will make a real difference but will be far more expensive than simply buying a proper 2WD vehicle with a smaller engine. You'd also ruin the resale value of your Blazer. Don't forget that if you drop all the gas guzzling extras, you won't need a larger engine to haul it everywhere to start with, so your best bet is to just trade in for a road going vehicle with the interior room that you need.

You'll also make a large saving in fuel by driving appropriately, maintaining correct tyre type (road tyres for road use, mud and snow tyres for the mucky stuff) and correct tyre pressures and not permanently carrying around heavy loads, roof racks or roof boxes unless absolutely necessary. Regular vehicle servicing can also make a large difference to mpg.

Posted on May 28, 2010

Testimonial: "THANK YOU VERY MUCH,like i told her the day he told her,if it was true then why didn't anyone else do this!!I figured he was just trying to see if she had a hubby(ME),now she just said if you forget what to do,your husband SHOULD know what to do?Hopefully we run into him someday,cuz i REALLY know what i'm going to do, i'm going to have him show me,and if wherever he points out isn't related to the 4wh.drive,he won't have to worry about gas mileage for a while,cuz it's kinda hard to drive with your eyes swollen shut,LOL,thanks for responding,we love our blazer the way it is,and we use it for pulling our camper,the old-lady is a penny-pincher,thats how this all came about,i'm going to write your name down for the future and for friends,i thought your answer was very professional,even the wife understood it,I THINK!"

  • Obertelli
    Obertelli May 29, 2010

    Happy to have been of assistance! Thanks for the testimonial :-)

    BTW: You may also see various "fuel saving" gadgets for sale which claim to use magnetism, catalyst covered pellets or multiple spark generators to improve mpg. All are usually backed up by testimonials, pseudo-scientific claims and are usually cleverly worded to avoid actually claiming they do anything at all when you examine the wording. Avoid them: they're all snake oil and you can be certain that manufacturers and legislators would have mandated their use long ago if they really worked.

    I have to be aware of how to cut consumption as where I live in the UK we have some of the world's highest fuel prices. Currently it's £1.22 per litre and when you convert that to US Gallons it works out at $6.68 per gallon. Recently it was as high as $7.23. Ouch! I love how cheap gasoline costs when I visit the USA.


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