Okay so with prices at the pump what they are and I have an old rebuilt slant 6 and automatic in the garage making me think to find an old A F M J or one of them old Mopes and make a daily driver out of it.

What is the best mileage one can expect with a Slant 6 and which car body is it in trans etc.

Thanks for the input

Low to mid 20's in top tune (critical) and relatively stock in an A-body (F M J-bodies are much heavier). MPFI and overdrive could potentially get high 20's.

Get more info at www.slantsix.org.

vm

My '68 Barracuda convertible is my daily driver. It gets in the mid teens with combined mountain/town driving while averaging 70+ mph on the freeways.

Next week, I'm taking it from the West Coast here over the Sierra's to Reno for Hot August Nights. I can give you my freeway milage then. I expect it will be in the low 20's with it's 2.96 rear end gears and 904 automatic, but it might do better.

It's been modified by Doug Dutra, who you can find on the http://www.slantsix.org/ website, with bigger valves, Super Six 2 barrel, a set of Dutra Duals(exhaust), head milled for a point higher compression, a re-curved distributor, the smaller of a Dutra spec'd cam and a few of his various tuning tricks. He is a great guy too!

It probably has half again as much power as a stocker, but is supposed to get a little better mileage in this state of tune. I can attest that it certainly has WAY more power, and that the mileage has not dropped over the way it was in stock form. Now, that is a cool thing these days! And, yes, I drive it the way I want to without reguard to trying to get good mileage, because I live very close to work. Keep in mind that my milage is with the top down, which causes a much greater drag on the car especially at 70 - 80 mph. My combined mileage includes a drive over a pretty good mountain once a week to get to the beach.

Another good feature about this 40 year old car, is that very few vehicles can keep up to it in the twisties. With it's freshened up and modernized suspension, sway bars, wide tires, and Koni's it corners like it's on rails without giving a harsh ride. All this without a car payment. You gotta love old Mopars!

Now the important part. Let's keep the idiots in Washington from imposing another National Speed limit reduction.

75 Sport, 2.76 rear, 904, 1 barrel, 15" Michelins, recurved distributor, timing at 10' BTDC at 800 rpm, 35' at 3k mech advance, 20-21 mpg highway, 63K original miles.

2 critical areas (1)the car body 63-66 A bodies are the lightest then 67-69 A bodies & 70 & up they got progressively heavier by leaps & bounds. (2)is proper quench so you can run a HIGHER CR without pinging which on a /6 means piston/rod/ head & deck milling changes & adjustments & as mentioned Doug Dutra is THE master & a real nice guy & knows all the tricks in addition to quench that will benefit you.

Cool I have been thinking about doing a small project like this since I have the first engine I rebuilt was a balance and blueprint rebuild on a 70 /6.

It ran like a top in the 70 Duster that I drove to college never did an mpg test on it back then ........mid 1980's and gas was alot cheaper back then.

I agree them early A bodies are the lightest I wonder out loud if the barracuda fastbacks would be worth the weight of the rear window vs the aerodynamic advantage of the sloping back window.

The lightweight aluminum case A833 OD trans would be a cool addition to the project currently I have 904 on the shelf for the /6.

EFI has been adapted IIRC someone did a project where they adapted a GM EFI deal to a slant 6 as well.

One last question has anyone ever figured the difference in mpg in an A body between a mild
318 2bbl and a /6

my duster, all stock with a 225, A833OD, 205/70R14 tires, 3.21 rear is a constistant 26.5mpg once all the storage gas w/sta-bil was burned out of it....

I believe a 273 would be a more fuel efficient, driveable package. A lot of the slants did not get any better fuel mileage than the 318 vehicles in the day, especially in heavier vehicles.
I had a few newer 318 magnum pickups that got 21-22 MPG, I don't think a slant in a full size pickup would approach that mileage, especially in the mountainous terrain I drive in.

Sheldon

Any ideas about hanging a hairdryer and some EFI on an old /6?

Ill have to hit the /6 board for that ? Im pretty sure