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#1 |
Registered User
Join Date: Mar 2014
Location: Salt Lake City
Posts: 128
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What could i possibly get for MPG with these two setups?
Possible Setup 1: 400 SBC 1989 k30 crew cab half ton axels and suspension under it 4 inch lift 33 inch tires 700r4 Throttle Body Injected 373 gearing
Possible Setup 2: 454 BBC 1989 k30 crew cab half ton axels and suspension under it 4 inch lift 33 inch tires 700r4 Throttle Body Injected 4.10 gearing TBI Possible Setup 3: 1987 k10 383 stroker 700r4 373 gearing TBI 4 inch lift 34 inch tires |
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#2 |
Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: What could i possibly get for MPG with these two setups?
Simple answer LOW!
If driving on the road and city streets, then the taller tires will make you work a little. The best gearing for the tall tires is the 4.10 gears. Bigger truck and taller tires will work your engine to get up to speed.
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Frank |
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#3 |
Registered User
Join Date: Mar 2014
Location: Salt Lake City
Posts: 128
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Re: What could i possibly get for MPG with these two setups?
my dad has a k10 85 with a good carb sbc 400 and 700r4 it really isnt that bad on gas for an older truck its tires are like 315 75 16 and the gears are 373 it at least hits 12 in the city dunno bout highway its only like 14 or so
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#4 |
Registered User
Join Date: Apr 2014
Location: Bloomington Indiana
Posts: 1,041
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Re: What could i possibly get for MPG with these two setups?
Those are kind of weird setups. I think the bbc would tolerate the 3.73 better than either of the sbcs, but with 33" tires, I would definitely go 4.11 on any of them.
TBI will give you better mileage than the carb setup DustyNova is talking about. I dunno. I think with the sbcs you would probably get 14-18 because of the overdrive and the TBI. Put a carb 350 on there without overdrive and you are looking at 10-12. That number I know for sure!
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Rich Weyand 1978 K10 RCSB DD. |
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#5 |
Registered User
Join Date: Jan 2009
Location: Louisville,Ky
Posts: 5,811
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Re: What could i possibly get for MPG with these two setups?
Half ton axles in a 1 ton should be a crime lol.If you care about mileage go diesel a 6.2/6.5 can bolt in easy or a 12 valve cummins swap.The cummins swap will cost more and need swap parts but can bolt in with all the swap parts.
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#6 |
Registered User
Join Date: Mar 2014
Location: Salt Lake City
Posts: 128
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Re: What could i possibly get for MPG with these two setups?
Diesel cost a bit around here more than gas not sure why i like the frame of the 1 ton but the suspension of a half or 3/4 ton XD
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#7 | |
Registered User
Join Date: Dec 2012
Location: Temple City
Posts: 3,586
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Re: What could i possibly get for MPG with these two setups?
Quote:
Other then that if I could of put a OD trans in my K20 I would of run 4.11's so I wouldn't lug on the highway. Not sure of which type of tires you plan to run, but my AT's need some rpm to keep the engine happy. More so with a SBC then the BBC. |
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#8 | |
Registered User
Join Date: Mar 2014
Location: Salt Lake City
Posts: 128
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Re: What could i possibly get for MPG with these two setups?
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#9 |
Registered User
Join Date: Mar 2015
Location: Midland Texas
Posts: 175
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Re: What could i possibly get for MPG with these two setups?
I had a small block 400 with a holley efi intake on a '89 sw slammed 2wd. It was a nightmare, I could never get it dialed in correctly. Either way, I don't think you're looking at a good mpg setup. I'm not sure exactly how good you are aiming for or able to get near 20mpg with any setup. An ls swap might get you near with the correct tuning. I know it's not a chevy.... First time Ford buyer here now.... Don't worry, I found the support group. 2013 F-150 4wd supper crew with a 4 inch lift and 36"x13" tires on 18" wheels for now. It's the 5.0, tuned it myself with HPtuners and I'm getting 21 mpg with 93 octane/No ethanol! on the highway running 80mph. Much more then that, it drops fast.
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#10 |
Registered User
Join Date: Aug 2009
Location: S.C.
Posts: 1,593
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Re: What could i possibly get for MPG with these two setups?
My thoughts are similar to rich weyand's, though, If you can tune, carb and TBI mileage may be closer.
An '87 I drove, with a 350, tbi and OD, would get 13. Unknown rear gears, but with BF Goodrich AT TA's, which I believe were 33". Sig trucks were 11 and 13 respectfully.
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'86 C-30 dually, 454/tbh400 '73 K-20 350/350/205 (sold ![]() I'm kinda like duct tape- no real purpose, but handy to have around. |
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#11 |
Registered User
![]() Join Date: Apr 2014
Location: detroit mi
Posts: 208
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Re: What could i possibly get for MPG with these two setups?
A lot of granny drivers here. I seriously doubt you will get any better than 10mpg on any of those. I know I never have done better than 10 mpg on any lifted square body. Big heavy tires and big lift add crappy mpg. Good luck keeping your foot out of the gas with any of those engines.
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#12 | |
Registered User
Join Date: Oct 2014
Location: Spearfish South Dakota
Posts: 407
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Re: What could i possibly get for MPG with these two setups?
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83 c10 long Box Daily Driver 90 Jimmy parked 98 Road King/ 06 Road Glide In memorium 63 impala SS/ 65 Chevy Panel 65 GMC Short Box/ 68 Camero |
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#13 | |
Registered User
Join Date: Aug 2009
Location: S.C.
Posts: 1,593
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Re: What could i possibly get for MPG with these two setups?
Quote:
My '86 is really efficient now. Blew motor a couple weeks ago....
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'86 C-30 dually, 454/tbh400 '73 K-20 350/350/205 (sold ![]() I'm kinda like duct tape- no real purpose, but handy to have around. |
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#14 |
Registered User
Join Date: Jan 2009
Location: Louisville,Ky
Posts: 5,811
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Re: What could i possibly get for MPG with these two setups?
Diesel may cost more at the pump but you will get more mileage out of that gallon then gas.I rather keep a 1 ton all 1 ton you can haul more and run a lot bigger tires later on.The 1/2 ton axles are good tell 37s the 1 tons 44s.
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#15 |
Registered User
![]() Join Date: Oct 2011
Location: central Oregon
Posts: 1,220
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Re: What could i possibly get for MPG with these two setups?
I get 12 mpg on road trips cruising speed 55/60 ..........90 v3500 crew cab stock 350 tbi with headers and dual exhaust , th400 , 4:10 gears, 6 inch lift , 37" tires.
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88 3+3 454 400 205 410 drw to srw still in pieces 90 3+3 350 400 205 410 srw 84 1/2 ton lb 6.2 4x4 parts truck |
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