What kind of mileage do you get?

[Vortec Lover]

Thinking of picking up a K2500 CCSB with the 454, What Kind of mileage do they get? more horrible then a 350?

most say roughly the same, maybe SLIGHTLY less, but don't count on it being a night and day difference

 

[satxwy]

I've heard 12 mpg highway is the best to hope for. But probably not much worse than a 2500 with a 350, like he ^ ^ ^ said

 

[96-1500]

most say roughly the same, maybe SLIGHTLY less, but don't count on it being a night and day difference

Yeah, I couldn't say for sure but I'd bet if there was a truck like mine, but with a 454 and 3.73s, it would probably get similar mileage.

 

[Vortec Lover]

Yeah, I couldn't say for sure but I'd bet if there was a truck like mine, but with a 454 and 3.73s, it would probably get similar mileage.

(carbed engines here) my dad had a truck with a 350 in it, he stuck in the 454 and his mileage went UP

 

[benz88]

Maybe I'll pick it up and swap in a 6L since I can get them cheap. ha

 

[atyates]

the less throttle it takes to move and hold whatever you put it in, the better gas mileage youll have. i had an 89 s10 i put a 350 in, i got 20 mpg highway all day..bigger motor took less to move the smaller truck. i only got 14mpg with the 4.3 that was in it..

 

[silverado13]

the less throttle it takes to move and hold whatever you put it in, the better gas mileage youll have. i had an 89 s10 i put a 350 in, i got 20 mpg highway all day..bigger motor took less to move the smaller truck. i only got 14mpg with the 4.3 that was in it..

yeah gas mileage isnt just about how little fuel is getting pumped into the engine, its about efficiency, if you pump a 4 banger in a 5500 pound truck, its going to have to work so hard to get it moving, vs a 250 hp, v8 doesnt have as much labor getting it moving, but once you are moving, throttle and fuel come in more, thats why in the newer LSX motors they have variable valve timing

 

[96-1500]

yeah gas mileage isnt just about how little fuel is getting pumped into the engine, its about efficiency, if you pump a 4 banger in a 5500 pound truck, its going to have to work so hard to get it moving, vs a 250 hp, v8 doesnt have as much labor getting it moving, but once you are moving, throttle and fuel come in more, thats why in the newer LSX motors they have variable valve timing

Yeah, 4.3s are a perfect example of this. My friend's 98 1500, 4.3 auto 4x4 3.42s, gets roughly the same mileage as my K2500 (details in sig). There are a lot of other factors (I don't know how well maintained his truck is, I think well but I don't know first hand), driving habits etc, but it's well known 4.3s in a full size are not economical.

My sister's '09 Kia Rio, 1.6 Auto 4-door sedan (essentially new, 32'000 kms on it currently), gets roughly 30 mpg with winter tires. It's revving over 3 grand to maintain speed on the highway. Pretty pathetic mileage IMO.

 

[Gatorboy]

Yeah, 4.3s are a perfect example of this. My friend's 98 1500, 4.3 auto 4x4 3.42s, gets roughly the same mileage as my K2500 (details in sig). There are a lot of other factors (I don't know how well maintained his truck is, I think well but I don't know first hand), driving habits etc, but it's well known 4.3s in a full size are not economical.

My sister's '09 Kia Rio, 1.6 Auto 4-door sedan (essentially new, 32'000 kms on it currently), gets roughly 30 mpg with winter tires. It's revving over 3 grand to maintain speed on the highway. Pretty pathetic mileage IMO.

I had a 4x4 blazer with the 4.3. It consistently got 18mpg mixed.

 

[silverado13]

a while back we were talking about ethanol free gas, well i just noticed that the closest gas station to my apt. just started selling 100% ethanol free gas, its owned by some guy from the middle east, id imagine that has something to do with it, any who i stopped in today to get some gas and realized that gas is around 25 cents more expensive there......so i decided to wait until i have a completely empty tank and then do a complete fill up with ethanol free, then run it down to nothing and then refill using standard 10%+ ethanol gas and see if the 25 cents a gallon more is worth it, what do you guys thinks?