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02-26-2012, 03:46 PM
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#1 |
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BlahBlahBlah
Join Date: Feb 2002
Location: Wa.
Posts: 20,044
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Gas mileage
My trucks aren't my daily's so gas mileage doesn't really concern me. But I was thinking about it today on 4x4 vs 2x4.
If a 3/4 ton 2 wheel drive is the same in every way drive train wise (engine, trans, tires, ratio, long box) as a 3/4 K20, would the mileage be pretty much the same as long as the 4x4 wasn't engaged? Or is there some drag with the front differential even when freewheeling that would cause a significant difference? And I imagine the same would hold true (whatever that is) if we were talking half tons.
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02-26-2012, 04:04 PM
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#2 |
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Registered User
Join Date: Jun 2010
Location: Columbus, Oh
Posts: 152
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Re: Gas mileage
Gotta remember that you've got the extra weight of the transfer case, front axle / differential, and driveshaft to carry around - even when disengaged. Then there's the power needed to turn everything.
Back when manual hubs were "in", you could eliminate a good bit of the parasitic drag, and only the weight was the issue - now everything is automatic, so the parts are turning all the time. |
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02-26-2012, 05:11 PM
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#3 |
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20' Daredevil (Ret)
 
Join Date: May 2003
Location: Jefferson State
Posts: 13,731
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Re: Gas mileage
^^ What he said, though I believe most newer 4x4 rigs have some sort of front-axle disconnect mechanisms.
Also, many trucks (newer ones maybe not so much) have additional aero drag from sitting a little higher.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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02-27-2012, 09:11 AM
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#4 |
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Special Order
  
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,851
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Re: Gas mileage
The fact that with these 4wds,even in 2Hi,the engine is turning the transfer case makes them get slightly less mileage.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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02-27-2012, 09:55 AM
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#5 |
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Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Gas mileage
you still have he front diff resistance compared to just bearings turning on spindles
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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02-27-2012, 11:46 AM
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#6 |
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Special Order
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,851
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Re: Gas mileage
With locking hubs (unlocking is more accurate) the wheels don't turn the axles/differential. The tires just spin on the wheel bearings like a 2wd.
__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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02-27-2012, 11:05 PM
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#7 |
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BlahBlahBlah
Join Date: Feb 2002
Location: Wa.
Posts: 20,044
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Re: Gas mileage
So over all probably not a huge difference, that is what I'm getting from the comments.
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02-28-2012, 12:06 AM
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#8 |
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Registered User
Join Date: Feb 2012
Location: Roy, WA
Posts: 53
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Re: Gas mileage
My buddy's K20 has the same 350/350 setup as my C10, and we get pretty similar mileage. He doesn't do quite as good as I do but he's not far off.
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