Gas mileage question for a 289

95GTS · 12-11-2001, 04:12 PM

What kind of gas mileage could one expect, roughly, from a stock 289 in a 66 Mustang? Assuming the car is 100% stock. I'm kinda, sorta, looking at one and don't know much about it yet. I'm needing something with at least around 20 mpg/tank. I don't know what tranny it has, though, or rear gearing. It's a hardtop/vinyl top. No vert.

red · 12-11-2001, 07:03 PM

I used to average about 16 mpg with the 289, but I had a 4 bbl. and used it often.

-red

Rev · 12-11-2001, 07:32 PM

I bought my '66 coupe in '68 with 17,000 miles on it. It had a 200 hp 289, single exhaust, 2bbl carb, C-4, and a 2.80 axle. I dindn't baby it and always got 16 mpg average city and highway.

Now I get 12 1/2-13 mpg but have a heck of a lot more fun.

Rev

Gearhead999 · 12-11-2001, 08:35 PM

You ought to expect 14 to 16 mpg.

Fostang · 12-12-2001, 01:32 AM

Well Rev your doing better than me. I get about 10.5 mpg around town. Rediculous I know considering the fact we have almost the same things. Everything stock even the 2 barell I got about 16. On the other hand the torino with a 4 barell edelbrock aluminum intake headers dual exhaust roller rockers gets about 18-20 mpg freeway.

Mercury · 12-12-2001, 01:35 AM

I have driven my old 64 1/2 Diane (289) to Pennsylvania and back several times from North Carolina.

On the highway she got 12 MPG. In City she averaged 7.5 MPG. That was before I rebuilt the top end and added the 1.7:1 rockers and the ported, shaved, CC'd heads. Now she probably gets Less.

1969Mach1 · 12-12-2001, 04:06 PM

I'm curious on what I'd get on mine. Any estimates for mine.
351-4bbl, 3.73 gears in the rear, Mach 1, my signature tells most.

thunderbolt · 12-12-2001, 06:08 PM

My 66 with a 2v 289 stock, 3 speed manual and 2.80 rear got between 20-22 on the highway. But it also has no power robbers; no ps, air, etc.

mustangman65_79 · 12-13-2001, 12:57 AM

I get 10 -12 with a 289 2bbl headers, but it's so bad because of the cam and timming chain, both need replacing bad.

Brian Browning · 12-13-2001, 08:54 AM

I get ~10mpg. 289, 351 heads, 625 cfm 4 barrel, 4 speed, 389 gears.

mustangman65_79 · 12-13-2001, 08:58 AM

I think the 389 gears is what did it. I have 290 in mine

Brian Browning · 12-17-2001, 02:05 PM

Yeah I don't have a tach, but on the highway its screaming at me!!!

mustangman65_79 · 12-18-2001, 07:55 AM

What about the freeway.

I'll let u know what I get when I replace my cam. I think it will stay the same because it's kinda a heavy cam.

66fastback · 12-20-2001, 10:34 AM

I ALWAYS got about 14 mpg with mine. this is experience gathered from several different Stangs. The best I ever got with a carb was probably 16-17.....and that included quite a bit of highway time AND that was with the 5-speed.

now with the fuel injected 302/5 speed combo, I am pulling in a consistant 20-21.....and I wonder what I could get on a trip.

12-11-2001, 04:12 PM	#1
95GTS Git jiggy Join Date: Oct 1999 Location: MO USA Posts: 865	Gas mileage question for a 289 What kind of gas mileage could one expect, roughly, from a stock 289 in a 66 Mustang? Assuming the car is 100% stock. I'm kinda, sorta, looking at one and don't know much about it yet. I'm needing something with at least around 20 mpg/tank. I don't know what tranny it has, though, or rear gearing. It's a hardtop/vinyl top. No vert. __________________ 1967 Mustang Coupe

12-11-2001, 07:32 PM	#3
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	I bought my '66 coupe in '68 with 17,000 miles on it. It had a 200 hp 289, single exhaust, 2bbl carb, C-4, and a 2.80 axle. I dindn't baby it and always got 16 mpg average city and highway. Now I get 12 1/2-13 mpg but have a heck of a lot more fun. Rev __________________ '66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi. O.B.C. #2 '66 coupe

12-11-2001, 08:35 PM	#4
Gearhead999 Registered Member Join Date: Sep 1998 Location: Oviedo, FL Posts: 992	You ought to expect 14 to 16 mpg. __________________ "Support our Troops" Dave 1968 Cougar 2004 Thunderbird 2007 F150 Harley-Davidson, SuperCrew 1986 LTD 1997 Ranger 1992 Honda Civic

12-12-2001, 01:32 AM	#5
Fostang Registered Member Join Date: Feb 2001 Location: Stockton, Ca Posts: 599	Well Rev your doing better than me. I get about 10.5 mpg around town. Rediculous I know considering the fact we have almost the same things. Everything stock even the 2 barell I got about 16. On the other hand the torino with a 4 barell edelbrock aluminum intake headers dual exhaust roller rockers gets about 18-20 mpg freeway. __________________ 67' Fastback-Supercharged 4.6 DOHC Cobra, T-56, 8.8 more to come. 67' Coupe-EFI, AOD, 8.8 90 Gt-Supercharged,MAF,TB,1.7's ripper, bassani x, 3.55's, 01' cobras, headers. 89'GT-Supercharged,Heads,Cam,Intake,TB,MAF,power pipe,headers,offroad exhaust,black bullits.

12-12-2001, 01:35 AM	#6
Mercury The Redneck James Bond Join Date: Sep 2000 Location: Fayetteville NC Posts: 1,707	I have driven my old 64 1/2 Diane (289) to Pennsylvania and back several times from North Carolina. On the highway she got 12 MPG. In City she averaged 7.5 MPG. That was before I rebuilt the top end and added the 1.7:1 rockers and the ported, shaved, CC'd heads. Now she probably gets Less. __________________ 64 1/2 "D" code Red Mustang Coupe. Red Baron, 2000 Perf Red Mustang GT. 5spd. Stage 2 CNC heads with Large Valves, Comp Cams (270-274 dur .550 lift), Forged Crank, DRP pistons, Manly H-beams, Pro M 87 mm Mass Air, 24lb Inj, 75mm TB, Plenum Spacer ,Long Tube Headers, Homemade H-pipe, 2 chamber Flows, 4:10's, Steeda Tri-Ax, LKW 70/30's, Eibach Drag Springs, Steeda SubFrames, Battle Boxes, Rear Girdle, Adj uppers, Alunimum Drshft, Southside Lift Bars. Project Cars, 64 1/2 6cyl coupe, 1930 Model A Nostalgia Rod.

12-11-2001, 07:03 PM	#2
red Registered Member Join Date: Sep 1998 Location: Millburn, NJ Posts: 310	I used to average about 16 mpg with the 289, but I had a 4 bbl. and used it often. -red

12-12-2001, 04:06 PM	#7
1969Mach1 HEY I CAN SET A NAME NOW! Join Date: Oct 2001 Location: Ontario, Canada Posts: 2,556	I'm curious on what I'd get on mine. Any estimates for mine. 351-4bbl, 3.73 gears in the rear, Mach 1, my signature tells most. __________________ 1969 Mustang Mach 1Sold 351-4V Windsor, 4 Speed MACH 1 - Moving At The Speed Of Sound. 1979 Mustang Indianapolis 500 Pace Car For Sale - Email me for Info 302-2V, 3-Speed Auto One of 2,106 made One of 405 sent to Canada. Yes those are caution lights, and No you can't pass me when there on. Ricer Hater's Club - Member #4

12-12-2001, 06:08 PM	#8
thunderbolt Registered Member Join Date: Oct 1998 Location: Houston, TX, USA Posts: 380	My 66 with a 2v 289 stock, 3 speed manual and 2.80 rear got between 20-22 on the highway. But it also has no power robbers; no ps, air, etc.

12-13-2001, 12:57 AM	#9
mustangman65_79 My poor 79 RIP Join Date: Oct 2001 Location: Suisun City, Posts: 2,320	I get 10 -12 with a 289 2bbl headers, but it's so bad because of the cam and timming chain, both need replacing bad. __________________ '84 mustang GT turbo '85 LTD '89 Camaro Irocz z28 '94 Lightning '96 Trans am

12-13-2001, 08:54 AM	#10
Brian Browning Registered Member Join Date: Sep 2000 Location: Hattiesburg, MS, USA Posts: 86	I get ~10mpg. 289, 351 heads, 625 cfm 4 barrel, 4 speed, 389 gears. __________________ 65 convertible, bench seat, '66 289 Hi Po motor, 351 heads, headers, duals, shelby intake, petronix, 4 speed top loader, 389 rear, road demon

12-13-2001, 08:58 AM	#11
mustangman65_79 My poor 79 RIP Join Date: Oct 2001 Location: Suisun City, Posts: 2,320	I think the 389 gears is what did it. I have 290 in mine __________________ '84 mustang GT turbo '85 LTD '89 Camaro Irocz z28 '94 Lightning '96 Trans am

12-17-2001, 02:05 PM	#12
Brian Browning Registered Member Join Date: Sep 2000 Location: Hattiesburg, MS, USA Posts: 86	Yeah I don't have a tach, but on the highway its screaming at me!!! __________________ 65 convertible, bench seat, '66 289 Hi Po motor, 351 heads, headers, duals, shelby intake, petronix, 4 speed top loader, 389 rear, road demon

12-18-2001, 07:55 AM	#13
mustangman65_79 My poor 79 RIP Join Date: Oct 2001 Location: Suisun City, Posts: 2,320	What about the freeway. I'll let u know what I get when I replace my cam. I think it will stay the same because it's kinda a heavy cam. __________________ '84 mustang GT turbo '85 LTD '89 Camaro Irocz z28 '94 Lightning '96 Trans am

12-20-2001, 10:34 AM	#14
66fastback Registered Member Join Date: Mar 1999 Location: Dallas, TX Posts: 208	I ALWAYS got about 14 mpg with mine. this is experience gathered from several different Stangs. The best I ever got with a carb was probably 16-17.....and that included quite a bit of highway time AND that was with the 5-speed. now with the fuel injected 302/5 speed combo, I am pulling in a consistant 20-21.....and I wonder what I could get on a trip. __________________ 66 GT Fastback,fuel injected 5.0, 5-speed, cable clutch, JBA's and duals, 3.40 gears and handling mods...just call me "Doc"

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