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

Re: MPG for a 402
 

8-10

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.

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.

Re: MPG for a 402
 

in my burb, I get more like 12 to 15 city/freeway driving. 402/Th400/3.07 gear.

Re: MPG for a 402
 

The owner is saying that he is getting better than 12. Should I believe him?

Re: MPG for a 402
 

my old man you to say that even the most honest people you know will stretch the truth a bit on two things:1)how long it takes to get somewhere
2)the gas mileage they got gettin' there! lol!

I am sure tho that Andy is the exception to this

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.

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?

Re: MPG for a 402
 

cool costs money... how cool do you want to be?

Re: MPG for a 402
 

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

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.....

Re: MPG for a 402
 

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

Re: MPG for a 402
 

Try a 3K Edelbrock EFI setup, OD trans and a light pair of shoes. But again, its a BB and a 3/4 ton.

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.

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.

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

Re: MPG for a 402
 

no one said that... no.

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.

Re: MPG for a 402
 

Get around 10, worth everybit of it. Great to have the power when you need it.

Re: MPG for a 402
 

IMHO, Rule number one for the best gas mileage = STAY OUTTA THE SECONDARIES!:burnout:

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).

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.