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  Mustangsandmore Forum Archive
  '64 1/2 to '68 1/2 -- The Classic Mustang
  65-67 6 cyl gas mileage

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Author Topic:   65-67 6 cyl gas mileage
70SportsRoof
Gearhead

Posts: 1064
From: Orange County, CA
Registered: Dec 2001

posted 12-17-2002 08:03 PM     Click Here to See the Profile for 70SportsRoof        Reply w/Quote
Okay, my '70 with a 351 W and FMX sucks up too much gas, maybe about 12 miles to the gallon. So, I'm going to be looking for a more fuel efficient car, so I was thinking a 65-67 6 cyl coupe. I'm avoiding '68 and newer so I don't have to smog it here. What kind of mileage does the 170-200 get with an auto? I'm hoping something around 20 mpg since I drive about 300-400 per week. TIA

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Gary M.-
1970 Mustang Deluxe SportsRoof (daily driver), 1946 Ford pickup, 1947 Ford pickup, 1957 Ford Fairlane 500 Town Vic

aGreenAgent
Gearhead

Posts: 148
From: Orange County, CA
Registered: Oct 2002

posted 12-17-2002 08:18 PM     Click Here to See the Profile for aGreenAgent        Reply w/Quote
Good luck finding one that gets 20 MPG. Mine gets 16 or so.

70SportsRoof
Gearhead

Posts: 1064
From: Orange County, CA
Registered: Dec 2001

posted 12-17-2002 08:27 PM     Click Here to See the Profile for 70SportsRoof        Reply w/Quote
Damn...well, that's still better than my '70. I was asking since my brother's '62 Falcon gets around 18-20 with a Ford-O-Matic 2 speed. I was hoping the Mustang would be around that too.

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Gary M.-
1970 Mustang Deluxe SportsRoof (daily driver), 1946 Ford pickup, 1947 Ford pickup, 1957 Ford Fairlane 500 Town Vic

aGreenAgent
Gearhead

Posts: 148
From: Orange County, CA
Registered: Oct 2002

posted 12-17-2002 08:48 PM     Click Here to See the Profile for aGreenAgent        Reply w/Quote
it would depend though. If I had the engine in mint condition, it might get closer to 20. I am saving up for a valve guide repair and a new carb. I don't know how much effect those will have on the mileage.

Fastback68
Gearhead

Posts: 4511
From: Sucat, Paranaque, Philippines
Registered: Jul 99

posted 12-18-2002 12:00 AM     Click Here to See the Profile for Fastback68        Reply w/Quote
Wow! My 302's not as thirsty as I thought! Of course, this all depends on how you're driving, but I'm not surprised if I take a long trip with mine and get 20, and my 6-cylinder Camaro is much better than that.
Are Ford sixes particularly thirsty beasts?

aGreenAgent
Gearhead

Posts: 148
From: Orange County, CA
Registered: Oct 2002

posted 12-18-2002 12:05 AM     Click Here to See the Profile for aGreenAgent        Reply w/Quote
I don't know in general, but the mileage I was talking about was city driving. I haven't taken mine on the highway for any extended period of time.

amartin725
Gearhead

Posts: 177
From: Mass
Registered: Nov 2000

posted 12-18-2002 12:18 AM     Click Here to See the Profile for amartin725        Reply w/Quote
Tuned properly, you should be able to get low to mid 20's out of a 200 auto (with the stock 2.80 rear). Personally, I'd go for a T-5. It makes the 200 much more fun and you'll get better mileage. The 4-cyl t-5's are dirt cheap and with the 3.95 1st gear, you can leave the 2.80 rear in there and have plenty of off-the-line jump and real low RPMs at highway speeds.

Al

aGreenAgent
Gearhead

Posts: 148
From: Orange County, CA
Registered: Oct 2002

posted 12-18-2002 12:24 AM     Click Here to See the Profile for aGreenAgent        Reply w/Quote
Well there you go, depends on the setup. And as long as we're tlaking about I-6's, how much HP do you think someone could get out of one?

Moneymaker
Administrator

Posts: 29200
From: Lyons, IL, USA
Registered: May 99

posted 12-18-2002 12:32 AM     Click Here to See the Profile for Moneymaker        Reply w/Quote
Most classic Mustangs with 200's that I work on and rebuild the 1100 Autolite get 22-25 MPG with an auto and 2.80 gears. Sticks slightly higher. A/C cars 2-4 MPG less.

------------------
Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
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NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
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goldenbob
Journeyman

Posts: 89
From: medford, or., United States
Registered: Jun 2002

posted 12-18-2002 02:56 AM     Click Here to See the Profile for goldenbob        Reply w/Quote
My old six 200 got about 23 mpg on the freeway, 0-60 times went from 16 secs to 11 secs when I installed a set of clifford long tube headers, then I went for an offenhauser tri power manifold with 3 single progressive webers (with a mild cam) and couldn't seem to keep my foot out of it...

amartin725
Gearhead

Posts: 177
From: Mass
Registered: Nov 2000

posted 12-18-2002 09:28 AM     Click Here to See the Profile for amartin725        Reply w/Quote
quote:
Originally posted by aGreenAgent:
Well there you go, depends on the setup. And as long as we're tlaking about I-6's, how much HP do you think someone could get out of one?

Considering they left the factory with about 85 Hp, it's easy to get more out of them. With a cam, some port work, larger carb, header and electronic ignition, you can easily gain 50 Hp or more. The max you can go to really keep it friendly (without water injection or a tolulene/gas mix) is probably around 160 - 180 Hp. That will beat a stock 289 without a problem. Forced induction and NOS can bring that number way up

Check out Fordsix.com for more, if you are interested.

Al

BornInAFord
Gearhead

Posts: 610
From: Bend, OR, USA
Registered: Dec 2002

posted 12-18-2002 12:16 PM     Click Here to See the Profile for BornInAFord        Reply w/Quote
I get from 20-25mpg highway, 15-20mpg city (closer to 15 in town with my driving style) in my 67 auto C-code with 2.80 rear.

My 66 4spd A-code with 4:11 rear gets about 12-15 city and around 20 highway (nearly 4000rpm at 70mph). Again, it depends how I drive.

Daniel

70SportsRoof
Gearhead

Posts: 1064
From: Orange County, CA
Registered: Dec 2001

posted 12-18-2002 07:36 PM     Click Here to See the Profile for 70SportsRoof        Reply w/Quote
Thanks guys. Those are the kind of numbers I was hoping to see. The 6 would mainly be my get to work kind of car, but the '70 will be my drive around town pleasure car. So that means I could fill the tank in that 6 cyl car only about once a week or so...sweet!

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Gary M.-
1970 Mustang Deluxe SportsRoof (daily driver), 1946 Ford pickup, 1947 Ford pickup, 1957 Ford Fairlane 500 Town Vic

mustangboy
Gearhead

Posts: 1343
From: Ont, Canada
Registered: Mar 2002

posted 12-19-2002 12:24 AM     Click Here to See the Profile for mustangboy        Reply w/Quote
What about swapping a 5 speed into your 70.You should be able to get better mileage than that out of it unless your motor is modified or your running a low rear gear.My J-code 302 68 mustang with a 4 speed and 3.00 gears got in the low 20s with 160,000 miles on it.

aGreenAgent
Gearhead

Posts: 148
From: Orange County, CA
Registered: Oct 2002

posted 12-19-2002 01:13 AM     Click Here to See the Profile for aGreenAgent        Reply w/Quote
quote:
Considering they left the factory with about 85 Hp

They left with 120 HP....

I65Stang
Gearhead

Posts: 6792
From: Sacramento, CA
Registered: Jun 99

posted 12-19-2002 01:15 AM     Click Here to See the Profile for I65Stang        Reply w/Quote
My '65 w/ the 200, auto, mystery cam, 3.50 rear, Holley 2300, and dual outlet header gets ~17 mph no matter how I drive it .

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Tim

M&M Member #35
1965 Mustang coupe, 200 I6, Holley 2300, Clifford header, true duals w/ 26" Smithys
1988 Mustang GT AOD vert, 15.810 @ 88.871 mph 100% stock w/ no traction
https://mustangsandmore.com/ubb/I65Stang.html

68 S-code GT
Gearhead

Posts: 3835
From: Sayreville, NJ, US
Registered: Mar 2000

posted 12-19-2002 07:01 AM     Click Here to See the Profile for 68 S-code GT        Reply w/Quote
The last 6 car I had was a 67 coupe with a 2.83 rear and a C4. It would get 18 MPG no matter how much I beat on it. The engine had about 100K miles on it with only a valve job done to it.

amartin725
Gearhead

Posts: 177
From: Mass
Registered: Nov 2000

posted 12-19-2002 09:52 AM     Click Here to See the Profile for amartin725        Reply w/Quote
quote:
Originally posted by aGreenAgent:
[QUOTE]Considering they left the factory with about 85 Hp


They left with 120 HP....
[/QUOTE]

Try again. They left with about 90. The 120 number was a 'Gross' rating taken with the motor on a stand sans all accessories including air filter, water pump, alternator, exhaust, etc..

This same HP measurement concept held true for the V8s as well. It's wasn't until 1972 that Ford actually started to be 'honest' about it's HP ratings.

Al

steve'66
Gearhead

Posts: 9835
From: Sonoma,CA,USA
Registered: Mar 2000

posted 12-19-2002 10:35 AM     Click Here to See the Profile for steve'66        Reply w/Quote
quote:
Originally posted by I65Stang:
gets ~17 mph no matter how I drive it .


That's funny Tim

SteveW

70SportsRoof
Gearhead

Posts: 1064
From: Orange County, CA
Registered: Dec 2001

posted 12-19-2002 11:57 AM     Click Here to See the Profile for 70SportsRoof        Reply w/Quote
quote:
Originally posted by mustangboy:
What about swapping a 5 speed into your 70.You should be able to get better mileage than that out of it unless your motor is modified or your running a low rear gear.My J-code 302 68 mustang with a 4 speed and 3.00 gears got in the low 20s with 160,000 miles on it.

Well, the thing is that i need something soon, as it costs me way too much $$ to get back and forth to work. And I really don't have the time to hunt down everything for a stick shift swap. I like having this Mustang as an auto...I'm trying to buy my brother's '66 289 fastback with a 4 spd, to convert to a T-5. My 351 is modified, with a fairly aggressive cam, head work done, etc...and I have the factory 3.00 gears in the 9". So I never really expected to great mileage out of it.

------------------
Gary M.-
1970 Mustang Deluxe SportsRoof (daily driver), 1946 Ford pickup, 1947 Ford pickup, 1957 Ford Fairlane 500 Town Vic

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