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#1 |
Registered User
Join Date: Jul 2008
Location: Kansas
Posts: 707
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MPG for a 402
Hello,
I'm looking at a nice looking 402 cubic inch big block with a turbo 400 tranny. Can anyone tell me what is the approx. mpg I would get out of this truck? Thanks, Joe |
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#2 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: MPG for a 402
8-10
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#3 |
Formerly- 1972SuperCheyenne
![]() Join Date: Oct 2008
Location: Wake Forest NC
Posts: 5,782
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Re: MPG for a 402
Yeah, 8-10 if you keep your foot out of it. If you're anything like me, that's hard to do.
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#4 |
I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
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Re: MPG for a 402
I think it will depend on the exhaust as much as anything.If it has nice quiet mufflers and very little exhaust sound than you may get 8-10 but if it sounds really good you will have your foot in it constantly which will kill your milage.
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The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil" |
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#5 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: MPG for a 402
in my burb, I get more like 12 to 15 city/freeway driving. 402/Th400/3.07 gear.
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#6 |
Registered User
Join Date: Jul 2008
Location: Kansas
Posts: 707
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Re: MPG for a 402
The owner is saying that he is getting better than 12. Should I believe him?
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#7 | |
Senior Member
Join Date: May 2002
Location: NORTHEAST OHIO
Posts: 493
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Re: MPG for a 402
Quote:
2)the gas mileage they got gettin' there! lol! I am sure tho that Andy is the exception to this |
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#8 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: MPG for a 402
if it was gettin 8 MPG like every small block truck I've had, I'd tell you that too.
My one ton gets about 5 to7 MPG now... used to get 12 - 14 I ain't gonna BS anyone about anything. The average in these trucks, across the board, is 10 - 12 acording to the opoll i took here a few years ago. The biggest thing that makes a 9 MPG truck into a 12 MPG truck is the driver. I used to have a POS 88 lincoln town car. My dad gave it to me, he was getting 17 - 22.... the best I could get was 13, normally it was closer to 10. He claimed it had all the power in the world, and I was pressing the pedal to find it (he was full of it, it was a worn out DOG) So if the old man selling it says 12, and you like the torque from the pedal on the right, then expect 10 MPG. Personally, i always say 10 MPG on these trucks. If you bank on that, then you'll usually be OK. |
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#9 |
Registered User
Join Date: Jul 2008
Location: Kansas
Posts: 707
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Re: MPG for a 402
This is a beautiful looking truck but I'm going to need something that will get at least 12 on the highway. I'm a conservative driver and I don't very often punch the pedal down, so I'm not sure what kind of mpg I would get with it. Is there anything that would help it get better gas miliage besides not drive it?
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#10 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: MPG for a 402
cool costs money... how cool do you want to be?
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#11 | |
Senior Member
![]() Join Date: Feb 2001
Location: New Madison, Ohio
Posts: 21,365
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Re: MPG for a 402
Quote:
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A husband can be right...or...A husband can be happy. ![]() 67-72 Chevy and GMC Trucks...The Classic Truck for the Classic Folk. ![]() 1970 CST Two tone green, 402BB, 400 Automatic, Tach, Buckets, AC, AM-FM, Tilt, GM CB, GM 8 Tract, LWB, etc ![]() ![]() JOHN 17:3...The better side of "LIFE" Remember: Everyday is a good day...Some are just gooder! |
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#12 |
Registered User
Join Date: Jul 2008
Location: Kansas
Posts: 707
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Re: MPG for a 402
Would it be foolish to take out the 402 and get a more economical engine for better fuel miliage?
I don't know..it's just a thought. What do you all think? Thanks for the help, Joe |
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#13 |
Senior Member
Join Date: Jan 2005
Location: SUNNY WARM BIKE RIDING COTTONWOOD ARIZONA
Posts: 2,097
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Re: MPG for a 402
my brother used to get 15+ out of his 4-speed/427 nova on his trips from vir. beach to pennsylvania....
i only got 8-10 outta my 402 in my 71 prostreet truck..... |
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#14 |
Senior Member
![]() Join Date: Feb 2001
Location: New Madison, Ohio
Posts: 21,365
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Re: MPG for a 402
I'm not sure if there would be that much difference in MPG between a 327/350 verses a 402 BB. I'll let others chime in who have better experience in this area.
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A husband can be right...or...A husband can be happy. ![]() 67-72 Chevy and GMC Trucks...The Classic Truck for the Classic Folk. ![]() 1970 CST Two tone green, 402BB, 400 Automatic, Tach, Buckets, AC, AM-FM, Tilt, GM CB, GM 8 Tract, LWB, etc ![]() ![]() JOHN 17:3...The better side of "LIFE" Remember: Everyday is a good day...Some are just gooder! |
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#15 |
Registered User
Join Date: Jul 2008
Location: Kansas
Posts: 707
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Re: MPG for a 402
It's a camper deluxe truck that is a 3/4 ton, so it would need the power. Is there anything I could add or do to it to get better gas mileage
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#16 |
Account Suspended
![]() Join Date: Aug 2005
Location: Southern UT
Posts: 906
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Re: MPG for a 402
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#17 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: MPG for a 402
or a honda maybe.
If you can't afford to drive one, or don't want to afford it, then there's no point in doing it. if you add fuel injection, or an overdrive, or anything like that, you'll spend 4 or 5 years of gas money to get the improvement. |
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#18 |
Registered User
Join Date: Jan 2006
Location: Take Off
Posts: 1,908
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Re: MPG for a 402
Buy a honda if you want MPG. No old truck is going to give you good MPG. What's the difference bewteen 10 MPG or 12 MPG or 8 MPG, they all suck compared to new cars. If you want a cool old Big Block truck, then relatively bad MPG is the price you pay. If you have to ask how you can get more mileage out of a Big Block, then you should not get one. My 396 gets horrible mileage, so bad I never even tried to measure it. I don't care, though. Gas is cheap here, compared to the rest of the world. I say burn it while we can.
Last edited by mclairmo; 08-16-2009 at 06:50 PM. |
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#19 |
Registered User
Join Date: Dec 2007
Location: Downingtown, PA
Posts: 22
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Re: MPG for a 402
Did you say you were looking for a 402/TH400 combo?
http://www.impalassforum.com/vBullet...d.php?t=227454
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#20 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: MPG for a 402
no one said that... no.
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#21 |
Registered User
Join Date: Sep 2003
Location: Franconia,N.H.
Posts: 1,029
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Re: MPG for a 402
well my brothers 402 got 8-10 and i just took my truck to pennsylvania for the all truck nationals and i got 16 mpg the whole way with a 350 3OTT with 3.08 gears. all driving was on the interstate at 75-80 mph. but my truck is also a 1/2 ton shortbed.
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(Only) Member of the CPNE Fan Club ![]() ![]() 67 C-10 350 with 3-speed tranny and 308 gears swb step ![]() 82 Z28 Camaro 355 small block over 350 hp and a borg warner super t-10 (blown engine) 72 Chevy K20 Suburban (future project) 70 Chevy K20 now 68 GMC K2500 2003 Chevy 2500hd ccsb 4X4 (daily driver) |
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#22 |
Senior Member
![]() Join Date: Nov 2007
Location: New Blaine, Arkansas
Posts: 751
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Re: MPG for a 402
Get around 10, worth everybit of it. Great to have the power when you need it.
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#23 |
70 Chevrolet=Obsession
Join Date: Jun 2009
Location: nice ca
Posts: 1,067
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Re: MPG for a 402
IMHO, Rule number one for the best gas mileage = STAY OUTTA THE SECONDARIES!
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#24 |
Registered User
Join Date: Feb 2009
Location: Somerset, KY
Posts: 398
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Re: MPG for a 402
I had a 97 Mitsubishi Eclipse I gave to my dad a few years back. I was getting 30mpg, he got it and gets around 38. He drives it alot easier I guess and got the extra mileage.....driving style definitely makes a huge difference (and, in the Mitsubishi Eclipses I have had, it seems the spark plugs I always upgrade to make a world of difference...not sure about these chevy trucks we have though).
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#25 |
Registered User
![]() Join Date: Nov 2006
Location: KINGSPORT,TN.
Posts: 3,035
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Re: MPG for a 402
Guess the 427 tall deck , 454 STEEL CRANK &.400 long rods with a sm465 and modern 14 bolt with 2.73 gears will be bad too in my 157"wb dually flat bed. I,ve got a nv4500 also but i really dont want it in my ton tk. I figure the sm465 with the super low 1st gear will be ok pulling out even loaded.
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I BELIEVE IN JOHN 3:16 Last edited by BCOWANWHEELS; 08-17-2009 at 02:12 AM. |
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