Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

6.2 guys ... mpg?

Discussion in 'The Garage' started by jackedjimmy350, Aug 31, 2005.

  1. jackedjimmy350

    jackedjimmy350 1/2 ton status

    Joined:
    Oct 20, 2000
    Posts:
    3,141
    Likes Received:
    0
    Location:
    Fort Smith, Arkansas 72901
    what are you getting for mpg?

    i have a chance to pick up an 84 m1008 at a reasonable price, and was wondering if it might help cure my current 10 mpg problem.
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

    Joined:
    Jul 23, 2000
    Posts:
    36,170
    Likes Received:
    1,377
    Location:
    E-town baby!
    I get 16.5 mpg with my 6.2 on the highway. I'm running the SM 465, NP 205, and the diff's from a M1008 (4.56's, rear detroit) and 39.5" TSL's.

    The more you can lower the cruise rpm's of a 6.2 the better mileage you'll get. Mine cruises at ~2600 rpm. Max efficiency for the 6.2 is about 1800 rpm where you can commonly see 23-24 mpg.

    Rene
     
  3. blasterD

    blasterD 1/2 ton status

    Joined:
    May 24, 2003
    Posts:
    410
    Likes Received:
    0
    Location:
    Anchorage Alaska
    I have an 86 K30 with a 6.2. Here's the specs: 7200lbs, SM465 transmission, 205 transfer case, 4.10 gears, 35x12.5r17 BFG AT, 4 inch Skyjacker lift. I get a consistent 15mpg average. My engine is pretty tired, it burns oil and smokes a lot at startup. I also run a lot of highway miles at 70-75mph. I understand that the lower you can keep the rpms on the diesel, the better mileage you can expect. I have seen as high as 18mpg and as low as 10mpg. The 10mpg was only during a very cold winter in Alaska when I was idling the truck for more than an hour total each day.
     
  4. jwglover

    jwglover Registered Member

    Joined:
    Jun 2, 2003
    Posts:
    88
    Likes Received:
    0
    I get 20 mpg real easy, 88 crewcab 4x4, 6.2 turbo, 5spd , 33 in tires, 3.73 gears,
    but it doesnt hardly have the power to pull the hat off your head

    pulling 7 ?? what a turd . and dont be in a hurry to get there !
     
  5. Kiwi John

    Kiwi John 1/2 ton status

    Joined:
    Jun 24, 2005
    Posts:
    249
    Likes Received:
    0
    Location:
    West Sussex, England, U.K.
    Cant vouch for the accuracy of the aftermarket tacho but mine cruises around the 15-1800 rpm on 33's and gets low to mid 20's mpg. Mainly cos road speed is lower here due to congestion. It doesn't get into the overdrive as often as i'd like.
     
  6. big_truxx

    big_truxx 1/2 ton status

    Joined:
    Oct 8, 2004
    Posts:
    2,272
    Likes Received:
    0
    Location:
    Canaan, Maine
    i get 18mpg with my 89 burb 6.2 :waytogo: not bad for a led sled.

    and if u get 20mpg with an 88 crew 6.2 turbo maybe I need to invest on a crew dual 6.2 one of thesedays :D
     
  7. Diesel Dan

    Diesel Dan 1/2 ton status

    Joined:
    Feb 27, 2002
    Posts:
    798
    Likes Received:
    0
    Location:
    Warren, Ohio
    Had a 1983 suburban 1/2ton, 4X4, 6.2/TH700R4, 3.42 gears, 235/75R15 would get 20-21 highway.

    1988 K30 crewcab 6.2/TH400/4.10s on 235/85R16s would get ~16mpg, with the gear vendors it bumped highway mpg around 18mpg. Towing a 35' jayco 5ver was 10mpg.

    2000 K3500 crewcab SRW 6.5TD/4L80E/4.10s running 245/75s gets around 16 on the highway, keep it 65 and under will get 17.

    1998 Dodge/cummins/auto running 3.54s and 285/75s is getting around 20 on straight highway pushing 75mph :D .
     
  8. diesel4me

    diesel4me 1 ton status Premium Member

    Joined:
    Jul 24, 2003
    Posts:
    17,547
    Likes Received:
    937
    Location:
    Massachussetts
    Same here...

    My 82 K20 with a 6.2 ,TH400,gears ??,245/75/16 tires,--gets about 15-22 mpg..lately its been sitting due to fuel prices,but I suspect the milage would be the greatest in warm weather..it used less fuel than my 400 small block did plowing ,I can say that for a fact!...like half as much!..Its no drag racer,but it has very good low end torque,and I dont care if wont take off like a jet...I'm happy with it.. :crazy:
     
  9. 6.2LTrailblazer84

    6.2LTrailblazer84 1/2 ton status

    Joined:
    Jul 4, 2005
    Posts:
    201
    Likes Received:
    0
    Location:
    san diego
    The more you can lower the cruise rpm's of a 6.2 the better mileage you'll get. Mine cruises at ~2600 rpm. Max efficiency for the 6.2 is about 1800 rpm where you can commonly see 23-24 mpg.

    So if you had a hybrid electric/diesel combo.. would this be about your max efficiency I wonder?
     
  10. steve_kibbe

    steve_kibbe 1/2 ton status

    Joined:
    Feb 4, 2004
    Posts:
    2,895
    Likes Received:
    2
    Location:
    Spartanburg, SC
    17-19 with 6.2 sm465 and 33's. I need to get this thing running :D
     
  11. 84zz4ss

    84zz4ss 1/2 ton status Premium Member

    Joined:
    Dec 28, 2004
    Posts:
    1,342
    Likes Received:
    0
    Location:
    Pensacola FL
    20-24 86 Burb 6.2 700R4 3.08
     

Share This Page