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Author
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Topic: Miles to the gallon
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irishmustang
Journeyman Posts: 25
From: Ireland
Registered: Mar 2005
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posted 09-04-2006 09:35 AM
 
What sort of miles to the gallon should I be expecting from a 68 coupe 289 automatic, MSD ignition, city or openroad driving.I went for a drive the other day with a friend with a 351 electronic ignition, manual 4 speed and he used about a fifthe less fuel, would this be right? thanks
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67stang
Gearhead Posts: 2687
From: Panama City, FL
Registered: Jun 99
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posted 09-04-2006 10:11 AM
I have always heard that a manual will get better fuel mileage than a slushbox.
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minnesotamustanger
Journeyman Posts: 36
From: Hutchinson, Minnesota
Registered: Apr 2005
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posted 09-04-2006 11:33 AM
It depends on the amount of modification, and how it is set up. A stock 289/ 2 bbl should get at least 20mpg/ hwy. My 67 w/289, headers, torker manifold, Edelbrock carb, only gets 12/15 mpg. I could probably increase that by tweaking the carb. Years ago, I had a 67 GT/ 390, 4 sp, 391 gears, all souped up that got 16 mpg! I'm not sure how much the crappy gas we have today contributes to the poor milage, I suspect it does though.Mike
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FSTBK65
Gearhead Posts: 483
From: Salem, Virginia 24153
Registered: May 2004
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posted 09-04-2006 12:33 PM
A big part of it is who kept their foot out of the gas the most. Hard acceleration and higher RPMs will kill your gas mileage. Gears is a big part of it too. If you have a 4 barrel and you open up the secondaries, I will use my one of my grandad's analogies "It's like flushing a toilet." On the interstate with a 3.70 gear my fastback got 13-14mpg on the way to Bristol. Keep in mind that I did not get on it at all. I kept the RPMs as low as I could and took it easy on the car.
I do not even calculate the MPG in the city!! ------------------
65 fastback. 302, Paxton Supercharger 7PSI, Edelbrock heads and intake,flowtechs with cutouts, x pipe and 2.5in flows. 4 speed. 368rwhp and 378ft lbs. 8.01 @ 87.72 mph 1/8 mi, 1.78 60ft.
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honeyburst
Gearhead Posts: 846
From: Nashville, TN, USA
Registered: Mar 2006
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posted 09-05-2006 08:26 AM
with my 73 conv., 302, C-4, holley 600cfm, edlebrock rpm intake, comp 268 cam and 275 gears I get 18 city, 21 hwy....IF I keep my foot out of it.......
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indyphil
Gearhead Posts: 3394
From: Senoia, G.A. USA
Registered: Jul 2002
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posted 09-05-2006 11:03 AM
Dont forget a US gallon is 3.8 Liters
a UK gallon is 4.4 litersI had a 289 with an automatic, stock rear gears cruise at about 20-22mpg (US gallons). A manual might get 2-3 mpg more. The difference between auto and manual on new cars is much less because the modern Automatics have a lockup torque converter - but these old autos dont lockup so they use more gas. When cold it would get 13-14mpg (US)
In city traffic it would get something in between probably about 18-20 depending on how heavy the traffic was. Now I put stroked it to 331 ci, and added more cam, its not as good, but it still cruises at about 18-20. Fuel mixture in the carb is HUGE factor in determining mpg. as are the rear gears (as mentioned), im still at about 3.00:1 gears
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Blacksmith
Gearhead Posts: 604
From: Front Royal, Va., USA
Registered: Feb 2006
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posted 09-05-2006 01:44 PM
My 65FB with tired old 302, Holley 600, Weiand High Rise, Tri-Y headers, Flowmasters, 3.00:1 rear runs 12-14MPG when I can keep my foot out of it. Highway runs at about 3100-3200RPM at about 75MPH.
Pour a wee bit of Tullamore Dew or Jameson's in her & she'd run better I'd bet...------------------
66 GT350H clone
302, Holley 600, Tri-Y headers, Flowmasters, power front disc brakes. [This message has been edited by Blacksmith (edited 09-05-2006).]
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Fastymz
Moderator Posts: 22791
From: Reno Nv M&M #1240
Registered: Apr 2001
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posted 09-06-2006 07:04 PM
With the old 3.40 gears I was getting 16-18 on the highway and 14-16 city. With the 3.80 gears and my HEAVY foot I now get 12-14 highway and 10-12 city. There have been times I can watch the gas gauge move.  thats DPM dollars per mile then  ------------------
oddly obsessed with big scoops on little Mustangs HOOD HACKERS DELIGHT!
My Pics 13.563 @ 108.64
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bridgmannm
Journeyman Posts: 26
From: Atwater, California
Registered: Feb 2005
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posted 09-07-2006 07:13 PM
pass everything except the gas station  ------------------
67 coupe * If it has t!t$ or tires, it will give you problems
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BornInAFord
Gearhead Posts: 610
From: Bend, OR, USA
Registered: Dec 2002
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posted 09-10-2006 12:47 AM
With my old 67 C-code (2BBL) and auto with 2.79 rear and stock everything, I would get around 16-18 around town (assuming it wasn't too cold out so the choke cut out earlier) and between 18-22 on the highway. I once got 25MPG on the highway when I was in an economy funk, but that was only once.In my current 66 coupe with Autolite 4100 4BBL carbed 5.0L HO, dual exhausts, 3.00:1 gears (soon to be 3.40) and Z-spec T5, I've been getting around 20-22 in performance-oriented mixed driving (40/60 city/highway). That's in the summer and the car is well tuned. City driving will be closer to 15-18 and highway trips will be closer to 25-28MPG, if I put a tennis ball under the accelerator.  I think a good tune, working choke and accelerator pump, and appropriate jets in the carburetor will do wonders to the mileage. But these aren't meant to be economy cars.
Daniel
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SkinnyMan
Gearhead Posts: 916
From: Tupelo, MS - USA (CA temporarily)
Registered: Jan 2005
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posted 09-10-2006 04:08 PM
quote:
Originally posted by irishmustang:
What sort of miles to the gallon should I be expecting from a 68 coupe 289 automatic, MSD ignition, city or openroad driving.I went for a drive the other day with a friend with a 351 electronic ignition, manual 4 speed and he used about a fifthe less fuel, would this be right? thanks
You need to know the rear end gear ratios too.Used to regularly get 22+ in the Mach I with 3.00 gears and a rational foot. ------------------
SkinnyMan
Tupelo, MS Thank you, Thank you very much!
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Stang28965
Gearhead Posts: 551
From: Webster New York USA
Registered: Mar 2001
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posted 09-16-2006 11:34 AM
I have a mild build 289 with a Holley 4bbl. I also have 3.55 rear gears and a 4 speed trans, I can get about 14-16mpg. I'd really like to install a t-5 and see 20+
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sprcoop
Gearhead Posts: 780
From: Tucson, AZ usa
Registered: Jan 2000
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posted 09-16-2006 10:37 PM
See specs in my sig. I only got 500 miles on it before I burned a piston so it is down now. I never really got it on the freeway for more that about 10 miles. For that 500 miles the secondaries were open every time I got a chance (that's what I built it for). 10MPG. I guess I'm saying that you should expect to get better than 10MPG.------------------
Jerry Cooper
Candy Apple Red, 66' Coupe, Wide Ratio Toploader, 9" 3.25 Traction Loc
302 .060 over, Solid Lifter,294 adv. duration, 246 @ .050,.544 lift
Eddy RPM intake, Autolite 1.12 Carb,
Hooker Comp. Headers, Dynomax Super Turbos, Flowmaster 2 1/2" Mandrel bent, H pipe
MSD RTR, Blaster2 Coil
70' 351W Heads home port job, 10.5 to 1 CR
15" Styled Steel Wheels, KYB Gas adjust Shocks
620 1" Lowered front springs, 1" Front Sway Bar, New 4 leaf
Rear Sway Bar, Shelby Traction Bars
P/S A/C (yep, GirlyMan)
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