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Horrible gas mileage

Discussion in '40- & 55-Series Tech' started by Cruiserhead05, Mar 16, 2004.

  1. Cruiserhead05

    Cruiserhead05 SILVER Star

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    Alright. i have an 82 fj40. weber 32/36, 3.70's and 33's i think i am getting something like 9 MPG which is horrible. I have an extras rebuilt aisin in my basement. Would putting this carb on help me out? or no. i may do it anyways as the Weber is a piece, in my mind.

    Thanks. also, any clue as to how hard swapping them out would be. i may just pay a good shop to do it and tune it since i dont know much bout carbs. any idea how long it would take a shop? trying to think about price here.
     
  2. 89GASHOG

    89GASHOG

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    I was under the impression that your figure was about average for a cruiser running balloon tires. I'm curious, do your 60's get much better?
     
  3. lowtideride

    lowtideride

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    i got about 250 to 300miles on 31s and now i get about 200miles a tank with 35s
     
  4. Poser

    Poser Oh...Durka Durka Durka. s-Moderator Supporting Vendor

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    Curious-

    What do you think that you *should* be getting, driving a brick with larger tires than stock?

    What are your driving habbits/style like? If the right foot spends more time in the throat of the carb, you are not going to get good mileage with anything..

    Good luck!

    -Steve
     
  5. IDave

    IDave

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    Well, I get 18 mpg on the highway with a non-USA stock Aisen and 29 inch tires. Seems like you should do better than 9 mpg.
     
  6. 60wag

    60wag SILVER Star

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    Is your engine getting up to temp quickly or at all? A stuck thermostat that runs the engine too cold can kill the milage. Also short trips around town with a cold engine in the winter can produce some disappointing milage.
     
  7. Poser

    Poser Oh...Durka Durka Durka. s-Moderator Supporting Vendor

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    [quote author=IDave link=board=1;threadid=13261;start=msg122436#msg122436 date=1079493481]
    Well, I get 18 mpg on the highway with a non-USA stock Aisen and 29 inch tires. Seems like you should do better than 9 mpg.
    [/quote]

    That is nice Dave.

    Do you drive for short distances, under 25 miles one way, multiple starts and stops daily? If so, what has your milage been for that?

    -Steve
     
  8. Landpimp

    Landpimp

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    82 fj40, 33x9.5's, 3,70's, new stock Aisin carb(old one got the same) all OEM tune up stuff, all smog crap in place and working. Also lifted and 8274 on bumper.

    running around town(for work, lots of trips a day) with a pretty heavy right foot, 25-45mph, stop and go, 5-10-15 min drives.......I get 11-12mpg

    on the freeway doing 60-70mph I get 16-17mpg.

    I aint bitching ;)
     
  9. Jman

    Jman

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    [quote author=Landpimp link=board=1;threadid=13261;start=msg122457#msg122457 date=1079495218]
    82 fj40, 33x9.5's, 3,70's, new stock Aisin carb(old one got the same) all OEM tune up stuff, all smog crap in place and working. Also lifted and 8274 on bumper.

    running around town(for work, lots of trips a day) with a pretty heavy right foot, 25-45mph, stop and go, 5-10-15 min drives.......I get 11-12mpg

    on the freeway doing 60-70mph I get 16-17mpg.

    I aint bitching ;)


    [/quote]

    Totally stock 87 FJ60, I get same results as Pimp. :D Except during those weeks when it's cold, I do nothing but drive two miles every morning to drop the kids off at school, then park--that mileages suuuuuuuuucks, I can have sub-10 tanks at that rate. :mad: But, put it back on the highway and it gets 17. :D
     
  10. rick_d

    rick_d

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    last time I was checking, 13mpg solid in 58,000 9/81 FJ40- that was same with drive plates on front axle!
     
  11. Poser

    Poser Oh...Durka Durka Durka. s-Moderator Supporting Vendor

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    John,

    What you are posting is what I have seen from other trucks of that similar set up...

    There are so many variables involved with this type of a question....especially when things have been modified and are no longer OEM...

    Good luck!

    -Steve
     
  12. IDave

    IDave

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    [quote author=Poser link=board=1;threadid=13261;start=msg122448#msg122448 date=1079494670]
    That is nice Dave.

    Do you drive for short distances, under 25 miles one way, multiple starts and stops daily? If so, what has your milage been for that?

    -Steve
    [/quote]

    Steve, when I am driving my 6 miles to town, cold starts (below freezing) and long warmups (half the trip, then cool down again), 4-6 trips per day, I get 13-15 mpg. Thats on studded snow tires in 4WD. In the summer, above freezing temps and on AT tires, same short trips 15-16 mpg.
     
  13. willsta2000

    willsta2000

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    My old F engine got about 7mpg on the freeway. It would take me a full tank of gas to get from Yakima to North bend (WA) 115 miles and two hours to burn 16 gallons.
     
  14. IDave

    IDave

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    You musta had a hole in your gas tank, too! :cheers:
     
  15. jl

    jl

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    Don't forget that the odometer reading is not the miles actually travelled on those balloon tires. You have actually driven farther. You might need to do a real miles/gallon calculation. :doh:
     
  16. Landpimp

    Landpimp

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    true, I corrected my mpg for the oversized tires.....I would hardly call 33x9.5's ballon tires however :flipoff2:

    [quote author=jl link=board=1;threadid=13261;start=msg122663#msg122663 date=1079539717]
    Don't forget that the odometer reading is not the miles actually travelled on those balloon tires. You have actually driven farther. You might need to do a real miles/gallon calculation. :doh:
    [/quote]
     
  17. TJDIV

    TJDIV Back in The U.P.

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    1994 GMC Yukon With a Built 355 and a Weiland Charger. 22 Degree Heads, Hooker Headers....insane. Not mine. Good Friend of mine.

    He gets GREAT gas mileage.
     
  18. Cruiserhead05

    Cruiserhead05 SILVER Star

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    wow. alot of info and questions. thanks. Maybe 9 or 10 MPG is normal for my setup. the old 60 with 290k miles gets probably 12-13 mpg but is stock with 30 inch tires. I think i am still going to put the Aisin on sometime soon after we get some body work done to it in my body class at school. Maybe the aisin will help out or doing 4.10's could improve it. Also my 2F runs very hot, i need to take care of that also, thinking it may be a bad thermostat. OHHH it seems like the list grows faster than i can take care of the things on it...
     
  19. wesintl

    wesintl

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    I can't remember if they still give us oxygenated(or what ever) fuel in the winter mos to help the smog situation. I do remember that it would give me 1-2 mpg less in the winter time.
     
  20. 72cruiser

    72cruiser

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    nahyo,

    i think you can tune it up a bit to get some more. with truckloads of stuff wrong on my cruiser (72fj40 w/ 79ish 2F & 31s) i still get 12-14 mpg anywhere. i also have a holley 2brl, and am thinkin about goin back to the aisin.

    good luck fixing it, just keep playin around with stuff and it'll fall into place.


    malphrus