454s - What kind of MPG are you getting?

[88GMCtruck]

i get about 12-13 highway, 11-12 mixed unloaded.

I get about 7-9 with the truck/camper combination.

454 NV4500 4.10s and 225/75R16

 

[bigdane36]

454/4l80e 4.10s 285's get roughly 9.5 in the city and highway my truck stays around 2200ish at 70 so I tend to drive 63 to 65 and keep it under 2000

 

[SCOTTYINWV]

That sounds more like a thermostat stuck open, to me. On the highway, you're already getting a lot of airflow. The fan clutch isn't going to over cool the engine.

Nah, the 195 thermostat functions properly. I mean, it has been in the 20s, and 80 mph 20 degree wind will cool it quick. I still do believe my clutch is staying engaged though.

 

[my name is alex]

Added a poll for easy reference.

 

[Charlie]

I have a 305 and I only get 9 mpg, should I be concerned?


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[my name is alex]

I have a 305 and I only get 9 mpg, should I be concerned?


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I would imagine so, unless you've just got a seriously heavy foot.

 

[Mangonesailor]

Good to know about the pump. I'm not correcting for tire size, but I believe it's a fairly minor correction - like 3-4%.

I have 4.10's, 4WD, and 285/75R15's with aluminum wheels and slightly aggressive tread. I've recently done a tune-up from the coil (Accel) to the plugs (Gapped to .055) with 8mm Taylors. Exhaust is a 2-in 2-out flowmaster that dumps under the bed (absolutely hate it until I let off of the throttle next to priuses).

I get 11.2 or so MPG, with the tire size correction that's around 12.5 (10%), and I have a heavy foot.


EDIT!
REDID MY MATH!!!! 11.2 is actually 12.4mpg.

 

[my name is alex]

I have 4.10's, 4WD, and 285/75R15's with aluminum wheels and slightly aggressive tread. I've recently done a tune-up from the coil (Accel) to the plugs (Gapped to .055) with 8mm Taylors. Exhaust is a 2-in 2-out flowmaster that dumps under the bed (absolutely hate it until I let off of the throttle next to priuses).

I get 11.2 or so MPG, with the tire size correction that's around 13-13.5 (8-10%), and I have a heavy foot.

Did you notice much of an increase in your MPG after the tune up, or is that about what you've always averaged?

 

[SCOTTYINWV]

Are you on facebook alex?

 

[my name is alex]

Are you on facebook alex?

Is anyone under 70 not? Don't use it much, but yeah, I'm signed up. Why do you ask Scotty?