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12-13-2013, 08:34 PM
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#1 |
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Registered User
Join Date: Jan 2012
Location: Walker, MO
Posts: 101
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Fuel Mileage question??????
I have a 1970 chevy k20, with 4:11 gears, 350 bored 40 over with 650cfm edelbrock carb and intake and mild rv cam, I have a 700r4 that i want to drop in my pickup. What kind of mileage would i be looking at.
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 Drivin People Insane With my Classic Chevy!
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12-14-2013, 12:28 AM
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#2 | |
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K5Camper
 
Join Date: Mar 2004
Location: Pueblo, CO
Posts: 1,513
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Re: Fuel Mileage question??????
Quote:
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Rob Z. 1975 K5 350/465/205/D44/12b 4" lift on 35's- RIP 1991 K5 8.1L/NV4500/241/D44/14b FWC Camper |
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12-14-2013, 02:41 AM
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#3 |
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Registered User
Join Date: Jan 2012
Location: Walker, MO
Posts: 101
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Re: Fuel Mileage question??????
I dont see were you get that i get 10 now with my 350 trans and thats with out overdrive, and the 700r4 has overdrive...
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Drivin People Insane With my Classic Chevy!
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12-14-2013, 11:11 AM
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#4 |
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Vintage 4x4s
Join Date: Sep 2010
Location: Prior Lake, MN
Posts: 4,305
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Re: Fuel Mileage question??????
what size tires do you have now and will they be the same with 700R4?
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67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore  )86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6 |
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12-14-2013, 12:42 PM
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#5 |
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20' Daredevil (Ret)
 
Join Date: May 2003
Location: Jefferson State
Posts: 13,728
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Re: Fuel Mileage question??????
There are so many factors that influence fuel mileage, it's impossible to say what you will get. As asked above, what tires are you running? If you get 10 mpg now, you might pick up another 1, maybe 2 at best, but that's about it. The best I ever got with my K20 (350, 4.10s) on a long trip was 11.5 mpg, and that's back when I was still running the stock skinny hard 7.50-16s.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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12-14-2013, 08:01 PM
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#6 |
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Registered User
Join Date: Jan 2012
Location: Walker, MO
Posts: 101
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Re: Fuel Mileage question??????
I have 33 eldarados, not really bigger than stock, just have an aggressive tread.
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Drivin People Insane With my Classic Chevy!
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12-15-2013, 12:15 AM
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#7 |
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20' Daredevil (Ret)
Join Date: May 2003
Location: Jefferson State
Posts: 13,728
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Re: Fuel Mileage question??????
33s are somewhat taller and certainly wider than stock tires, and that hurts fuel mileage. Wider tires often run lower air pressure which also hurts. Something like a 235/85-16 is probably about the right height (depending on your OEM tire size) and skinnier, and can run higher pressure -- which helps increase fuel mileage.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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12-15-2013, 12:22 AM
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#8 |
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Registered User
Join Date: Jan 2012
Location: Walker, MO
Posts: 101
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Re: Fuel Mileage question??????
I would get you the exact tire size but the pickup is in the shop at the other house, heres a picture when i was rebuilding the frame.
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Drivin People Insane With my Classic Chevy!
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12-15-2013, 03:08 AM
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#9 |
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Registered User
Join Date: Jan 2009
Location: Louisville,Ky
Posts: 5,811
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Re: Fuel Mileage question??????
Real world you will pickup 1 to 5 mpg probably with it.
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