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gas milage
https://www.slantsix.org/forum/viewtopic.php?t=8628		 Page 1 of 1
Author:  rhyno6 [ Sat Mar 06, 2004 8:51 pm ]
Post subject:  gas milage
what should i be getting for milage with my 68 six? what's a good carb to use for both power and milage?
Author:  johnnysix [ Sat Mar 06, 2004 10:51 pm ]
Post subject: 
Ordinary tuneup procedures should produce decent mileage.FIX YOUR ACCELLERATOR PUMP !!! Stick w the one barrell for economy .Anyone Know which one barrell is the most fuel effeciant?? On a 68 val w auto I would expect 20-22 mpg's.Doesn't explain why I had a 67 fury II which I swear got at minimum 25mpg's.{318 auto}.Also depends on your rearend ratio.Maybe if we keep at it ,these slant six freaks will tell us what ratios came w what cars,engines and trans combos ,,year by year...Good luck my brother!!!! If you removed the back seat,you might get an extra tenth of an mpg. !!!!!!!
Author:  Doctor Dodge [ Sun Mar 07, 2004 7:51 am ]
Post subject: 
The most common gear ratio for a 68 automatic in an A-Body is the 2.94 ratio. 3.23 and 2.76 were also common and avaliable with combos like manual shift of towing packages. Performance gears for the 7 1/4 included the 3.55, 3.91 and 4.10 but these ratios are for racing, not for milage.

As for the 1bbl carb., I have been able to get the best mpg fron the Holley 1920 "Economaster" type carb. With some tuning, 24-28 mpg is possible.
With a light vehicle, overdrive and other "tricks", 30-32 mpg has been reported from a 225 SL6. (I could never get more then 28 :? )
DD
Author:  70valiant [ Sun Mar 07, 2004 9:32 am ]
Post subject: 
I just got 20.1 on a 300mile round trip. I'm not really sure I figured it accurately though. I'm running 225/75R14's which are much larger than stock size tires. It regesters almost 9.5 miles to 10 actually driven.
All my mods are on my sig.
Author:  70valiant [ Sun Mar 07, 2004 9:33 am ]
Post subject: 
oh yea I was cruising between 65-70mph most of the way
Author:  relic-lover [ Sun Mar 07, 2004 11:23 am ]
Post subject:  63 dart mpg
My son's 63 2 door hardtop dart gets 18 mpg at best. It has a
1967 engine with 5000 miles on a full rebuild and a carter bbs
1 barrel - It is stock for the most part - the pertronix points
replacement kit being the only mod that I think would possibly
affect gas mileage.

I don't know the rear end ratio but the rear seat is still installed. :lol:
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