What MPG should I expect (94 k3500 5.7)

[chris032188]

Just gassed up first time tracking, only got about 7mpg. Truck was running kind of ****** during that and I just did a tune up, what should I expect for this truck? It's a nv4500 also. I figured I'd should get around 12-13, but just want to be sure.

 

[chris032188]

Should also add, it's a utility body so that def adds some weight

 

[Cadillacmak]

Year, engine, gears, mods?

 

[chris032188]

94 5.7 k3500 utility body no mods, assuming stock gears. Nv4500. It isn't screaming at highway speeds

 

[Cadillacmak]

94 5.7 k3500 utility body no mods, assuming stock gears. Nv4500. It isn't screaming at highway speeds

7mpg is a bad running big block, you should get at least 12. My 94, 454, 4L80e, 4.10's got 9 and 10 mpg

 

[Keeper]

If the truck is new to you, I would check for leaks in the fuel system also. A hole in the gas tank from rubbing inside the liner is a known issue. Can you smell gas when you walk up to it after it sits for a while? If the leak/hole is small enough, the gas will evaporate and won't leave a puddle on the ground, but you'll definitely smell it. btdt

 

[chris032188]

Gonna check it again next fill up, this one was a ton of stop and go while I was doing work to it. Hopefully it improves some

 

[chris032188]

And truck is new to me, about a month I've had it. Have done a bunch of work to it since I got it. None of the sensors were hooked up, alignment was jacked up, new cap rotors, it had no thermostat

 

[Sean Buick 76]

Run a bottle of seafoam in the tank next time you fill it up. It will help clean up the fuel system and the combustion chambers.

I had my 01 Yukon parked for 7 months and it was running terribly when I fired it up. I put a bottle of seafoam in and within 5 minutes it was running perfectly.

I would say 12 mpg would be a good goal to shoot for