6.2 guys ... mpg?

[jackedjimmy350]

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.

 

[tRustyK5]

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

 

[blasterD]

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.

 

[jwglover]

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 !

 

[Kiwi John]

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.

 

[big_truxx]

i get 18mpg with my 89 burb 6.2 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

 

[Diesel Dan]

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 .

 

[diesel4me]

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..

 

[6.2LTrailblazer84]

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?

 

[steve_kibbe]

17-19 with 6.2 sm465 and 33's. I need to get this thing running

 

[84zz4ss]

20-24 86 Burb 6.2 700R4 3.08