View Full Version : Chevy 454

Grass Happens
07-28-2008, 01:34 AM
I'm looking hard at a 91 chev k2500 with the 454, and was wondering what the gas mileage difference was with a 350. I realize that unloaded it will be much worse then the 350, but what about loaded with a 12-14' open trailer or pushing snow? Its a very vary clean truck with 105,000 miles on it, but if the 350 is a more efficient motor, I'll hold off.

07-28-2008, 03:47 AM
I think those that run 454 don't really pay any attention to fuel consumption.

I have a 3/4 with a 350... 11 in town with trailer. Better on the highway if I behave. I looked at a pickup with a 454 loved the power... But for what I am going the 350 is hard to beat.

07-28-2008, 11:55 AM
We have a 1999 Chevy 3500 454 105,000 miles with a 12 steel flat bed and get in the ball park of about 10 mpg. So I would think that the 2500 would get a little better.

Now I have never plowed snow before but if you get some wet snow I think you would deffinatly like the 454 better just for the extra power.

07-28-2008, 12:03 PM
I have a 1992 K3500 with a 454, with a stick and I get in about 7-8 mpg towing a loaded 14' open trailer and about 6mpg pushing snow. It will move a house, but wont pass a gas station.

07-28-2008, 12:59 PM
Look for a newer one with the 8.1 (496). They do get better mileage and still will pull the house and outhouse.

Gravel Rat
07-28-2008, 02:39 PM
The older 454s with TBI injection are a little piggy but the power is nice. A 454 or any big block can get good mileage just drive them right. Stomping a 454 to the floor isn't the fuel saving way.

Accu-cut Lawn Care
07-28-2008, 04:27 PM
If it has the 3 speed automatic tranny... RUN! It'll get about 6 to 8 mpg.

Grass Happens
07-28-2008, 06:44 PM
well Like i said this thing is super clean, i haven't found one with the 5.7 around as nice as this. For most of my towing a 5.7 would suffice, but like i said this sucker is nice. no is the 4L80E, the overdrive TH-400. Which is actually the only problem, the reverse spring deal took a poop, which is why he is selling it so cheaply, as i would need to rebuild/replace the trans. but no rust, E range tires with 1500 miles on them, regular cab long bed. I just to want to go bankrupt fueling this thing, but if i could manage 10-12ish, it should do.

07-28-2008, 11:23 PM
My dad has a special edition 1990 SS454 and I tell you that thing will get 8mgp idling. But man that power is awsome.

07-31-2008, 12:25 PM
my 440 in my dodge gets about 8 when unloaded or loaded. It has a three speed in it. My buddy has a 454 and he gets about the same mileage as me when we take trips. Its a stump puller though.