mpg thread

[12vctd]

I got 19mpg hand calculated out of my 1028 all the time when I had the 6.2 and the 37 inch boggers, but I also was cruising around 56mph max. And I drove the truck like it was gonna break at any moment (very easy on the throttle) and belive it or not the turbo helped my economy. And I could avg 16mpg driving around town all the time. The times things got very nasty mpg wise was towing anything, it didn't matter what it was seemed to kill the wheezy 6.2 to about 10 and under. I did have my speedo gear also changed for my tire size. But the best mpg mod I made was the 12valve. And I avg 22mpg again hand calculated driving all the way from Alaska to kentucky, with a 70 mph avg. But I also made that trip taking it easy. Letting the torque curve carry the truck. I avg 20 mpg high way in my 97 dodge ram with 4.10 gears, 33 inch tires, and alot more weight.

 

[4bogginchevys]

good question

how do ppl get 18-20 mpg on a 1008?

Down hill, with a tail wind, on 33's doing about 35 or 40 for 300 miles. Does this place exist, i'd move there.

 

[BAMA91]

Down hill, with a tail wind, on 33's doing about 35 or 40 for 300 miles. Does this place exist, i'd move there.

with a m1009 pushing from the rear right lol

 

[Buckmaw]

Went for 400mile round trip the other weekend and got 19.3 at 65/70mph
and on the way back, I got 21.1 mpg at 60mph.

M1009
stock setup

 

[cucvdonk]

I got 19mpg hand calculated out of my 1028 all the time when I had the 6.2 and the 37 inch boggers, but I also was cruising around 56mph max. And I drove the truck like it was gonna break at any moment (very easy on the throttle) and belive it or not the turbo helped my economy. And I could avg 16mpg driving around town all the time. The times things got very nasty mpg wise was towing anything, it didn't matter what it was seemed to kill the wheezy 6.2 to about 10 and under. I did have my speedo gear also changed for my tire size. But the best mpg mod I made was the 12valve. And I avg 22mpg again hand calculated driving all the way from Alaska to kentucky, with a 70 mph avg. But I also made that trip taking it easy. Letting the torque curve carry the truck. I avg 20 mpg high way in my 97 dodge ram with 4.10 gears, 33 inch tires, and alot more weight.

How hard was it doing the cummins swap and do you have any pics of it? Would like to see it.

 

[Phily]

i can see a 1008 getting 24. with a 12valve cummins, NV4500 and like 3.55 gears

They will get 24MPG w/ the 4.56's if the speed is kept around 35-40MPH

 

[12vctd]

cucvdonk, I have pic's of alot of swaps in straight axle chevys, but my 1028 I dont have pics of, it was wrecked and I never took any pics of it. The swap for me was very straight forward and simple, but I also had done 5 6bt swaps before this truck. If your fab skills are good, and you have a decent knowledge of the 6bt the swap can be done very quick and easy. The cost jmps when you have to pay for adapters and what not. I like to get complete donor trucks saves me alot of money and time on parts.

 

[mtjbrown]

I am new to the cucv world, just bought a '86 contact truck, service body vs. pickup bed. What can you realistically expect for mileage with stock tires? Also, what would be the downside if any to say 305/65/16's or 255/85/16s?? Thanks in advance,
Mark

 

[panama]

Bone stock '85 1009
Bought over Thanksgiving in N.C.
Cut up the air cleaner housing, replaced filter, changed oil, ran tank dry and refilled adding a bottle of diesel additive/injector cleaner
Drove 750 miles to Miami between 70-75 mph
Averaged 18 mpg and ran great
Looking forward to breaking 20 mpg with it!

 

[noel.isaac]

I am new to the cucv world, just bought a '86 contact truck, service body vs. pickup bed. What can you realistically expect for mileage with stock tires? Also, what would be the downside if any to say 305/65/16's or 255/85/16s?? Thanks in advance,
Mark

10...if your lucky. that's what we typically got on our 50 mph convoys to and from South Dakota. They only had 175 mile range, and that is leaving 25 miles of wiggle room.

 

[JWNathan]

'86 M1028
Bone stock and empty with 65k miles.
I get 17mpg combined, all highway miles are @ 60mph

 

[eric_banks32]

'86 m1008 85k miles gets 18 if i drive it grandma style or 16-17 driving normally. Try to stay below 55 but it does see 60 if i have to get on the highway

 

[mtjbrown]

I found a set of used BFG 255/85/16 and put them on the truck, haven't got mpg figures yet but it seems a little better. Even allowing for the speedo error due to the bigger tires.

Mark

 

[AJMBLAZER]

Because you're raising the effective gear ratio to a more street friendly place. Like putting lower numerical gears in the diffs. Not much, but a little.

 

[mtjbrown]

Because you're raising the effective gear ratio to a more street friendly place. Like putting lower numerical gears in the diffs. Not much, but a little.

Yeah, that was my intention, and I think its working. I am wondering if 36' tires would be too much wih a stock lift and how they would affect it?

Mark

 

[booger-hooker]

I have a M1010 that on one trip out to Wendover, NV I got just a touch over 15 MPG driving 53 MPH on I-80 for a couple tanks of fuel but most of the trip I was in the 14's. I have Firestone Destination M/T tires on it and stock otherwise as it's been very reliable and a lot of fun to drive and own. I have a fuel leak up under the breather from a metal fuel line that leaks down on to the intake manifold so my MPG is not real good now and will get that fixed when I return from Iraq.

 

[four_by_ken]

'85 M1008. 50k miles or so. All stock other than a set of 33s.

14mpg. Mostly two lane country roads and some highway. If I slowed it down some on the highway, it would probably come up. But, it seems like I am late or real excited to get where I am going each time I hit the highway with it.