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Author
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Topic: Gas mileage
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FASTFORD
Gearhead Posts: 105
From: USA
Registered: Aug 2002
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posted 09-16-2002 05:12 PM
   
I have a '67 coupe with a 4bbl 289. First off, what kind of gas mileage should I be getting now?
My second question is how much gas mileage will I lose if I install GT40 cylinder heads...and how much hp gain will I get?
Please Reply...Thanks
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Fastymz
Moderator Posts: 12015
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 09-16-2002 05:40 PM
What trans are you using and what rear gears do have.What shape is the motor in,and what carb do you have.SCOOP ------------------
2.634 60's
[email protected] 1/8 mile 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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FASTFORD
Gearhead Posts: 105
From: USA
Registered: Aug 2002
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posted 09-16-2002 05:47 PM
I have a c-4 with 2.79:1 gears (soon to be 3.27:1), recently rebuilt engine, and 600 cfm holley
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Fastymz
Moderator Posts: 12015
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 09-16-2002 05:52 PM
I'd say you should get 15-18mpg if you keep your foot out of it.
And for the GT heads I've read they are good for 20-30hp.And they should hurt milage at all.SCOOP ------------------
2.634 60's
[email protected] 1/8 mile 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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mustangs68
Moderator Posts: 18183
From: Hampton,Virginia,USA MCA#39406 M&M #12
Registered: May 99
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posted 09-16-2002 06:00 PM
I measure my gas milage by the year 
sam
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indyphil
Gearhead Posts: 877
From: Lafayette, IN, USA
Registered: Jul 2002
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posted 09-17-2002 08:35 AM
I have a 68 289 with 2 barrel carb, 2.79 rear end and c-4. I got about 22-25 mpg at 70mph highway cruising. Since then I have richened the carb up a little so Maybe I get 20-22 now. I would guess if everything is running sweetly that you should get 18mpg on the highway with that 4 barrel depending on how rich you run it.You shouldnt hurt gas mileage with heads, sometimes headers and other perf mods can actually help gas mileage if you leave the carb alone. The 3.27 rear will hurt gas mileage a lot more than the heads
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V8 Thumper
Gearhead Posts: 3529
From: Orange, Ca. United States of America
Registered: Dec 2001
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posted 09-17-2002 08:58 AM
My '289'  gets 9-10 mpg 
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Pierre
Gearhead Posts: 366
From: France
Registered: Apr 2002
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posted 09-17-2002 09:05 AM
quote:
Originally posted by V8 Thumper:
My '289' gets 9-10 mpg
Did you forget your drain plug or do you floor it at every light ? I would be curious (if this is not classified info ) to see your engine set-up
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V8 Thumper
Gearhead Posts: 3529
From: Orange, Ca. United States of America
Registered: Dec 2001
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posted 09-17-2002 09:49 AM
quote:
Originally posted by Pierre:
Did you forget your drain plug or do you floor it at every light ?
LOL  No, and yes  Pierre, here I am goofing around, and I'm late for work , I gotta go  I'll post some specs and pics soon. Hint: not exactally two hundred eighty nine cubic inches any more
[This message has been edited by V8 Thumper (edited 09-17-2002).]
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mustangs68
Moderator Posts: 18183
From: Hampton,Virginia,USA MCA#39406 M&M #12
Registered: May 99
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posted 09-17-2002 12:54 PM
seriously mine get about 10-12
sam
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