I have just under 225 miles on the car so far. I didnt build it for fuel economy, but I thought it would be better than what it is. I am getting between 7-8 mpg out of the car so far. How you others doing with yours.


my set up is

426 siamese block
10.25 to 1 j and e piston
manely rods
eagle crank
426-2 indy intake
850 mighty demon
comp cams 508/519 235 at 50 mechanical cam
msd
2 1/8 hooker super comps
3 inch flowmaster exhaust
bowl and pocket work on the mopar aluminum heads
dana 60 with 3.54
4 speed
29.5x15.5x15 rear tire
2850-3000 rpm's at 70 mph
car weighs in at 3640 with a 1/2 tank


What do you think and how are yours doing. This is still a lot better than my max wedge was doing.

I don't think mine's ever done better than that, but in 20 years I've never really checked it; I just make sure there's gas available every 100 miles if it's going that far.
Mine's 438", 2x4 inline original carbs, 10.8:1, 260* @ .050, .565/.547 lift, 4-speed, 4.10, 27.5" tire, 3800 lbs, see Attachment. I generally keep it around 3000-3500 RPM but I have a rule that every time out, it sees full throttle at some point.

If you have to ask then you need to swap it for a leaning tower of power. That sounds like a normal milage figure for that engine.

we have twins.

The best I've ever done with mine is 11.65 mpg cruising at 55-60. It usually gets about 9.6 on the highway. It depends on how many of the carbs I use! It is 10.5:1 has a torqueflite and 4.10 gears.

7 or 8 around town and getting on it once in awhile is about right. With 3.54 or 3.23 gears I generally get 13-14 MPG on the highway with them.

Sheldon

That really isn't as bad considering that I rarely get more than 12 mpg around town in my 4.6 thunderbird.

about 7 give or take on the speed/rpm's.

That's not that bad really. I estimate I only get about 9 or 10mpg with my small block.

OUt on the highway with an occasional romp I'm getting low 13's runnin' @ 3000-3200 rpm's.

I haven't checked around town yet.

Back in 84 I Drove my 71 RT Hemi Charger 4speed 3:54 Dana from Chicago burbs to the Holiday INN at Indy, about 230 miles.. one tank of gas..
factory carbs, a little bigger cam..
Got to drive around the INdy 500 track that year...

Wait, shouldn't it be GPM?

You guys will probably call me a liar but years ago when I move back here I drove my Hemi GTX back following my wife. She drove 55 to 60 and I never got out of the back 2 barrels. I got an honest 19mpg. I had a mild hydralic cam in it, quick advance curve in the distributer, 2" headers, 4-spd, 3.54 gears, and LR60-15's. That's the only time I ever drove it that nice, it about killed me. Dave

I get alittle over 10 miles to the gallon
with crossram 770's, 410 gear, 31.5 tires,and
565 cam in a 70 cuda. That would be running 55-60
mph. If I run it hard maybe 5-6 mpg

logan426

Haven't got the hemi done yet but the 440 in my 68 RR, auto, 3:91, bored 30 over, mild cam, 9:1 pistons, carter 750 gets about 14 at 70 mph.

I'm expecting 11 out of the hemi on the hiway

I get 16 miles to the gallon in a 69 RR 472 Crate motor with a single 4 barrel and 850 Holley with a Keisler 5 Speed and a 4:10 rear doing 75MPH @2200 RPM.

My totally stock 68 4 sp 3.54 geared RR gets around 11-12...doing typical to and from cruise duty in a suburban area. I drive pretty gently though..at least most of the time.
Incidentally, it gets better mileage than my 4 speed 3.91 geared AAR doing the same thing.

Gas milage ??...gas milage ??...Hahahahahahah.. I supposedly have a big buck , 20 gallon Triangle MFG. tank, which only holds 18 gallon's ( they lied), From my house to Summit is 37 miles, it took alomost all 18 gallon's to get there. Probably had a quart to go.. I don't know..472, 10.5 to 1, 4.10's, 28" tall tire.I like to cruise at 3500 RPM..Single 1050 Dominator, and no, I didn't keep it on the "front" two the whole way there..

My 318 Challenger got about 7 mpg (the carb was junk) before I put the 360 in it. If you ever do get worried about fuel economy, I'll trade you the slant six out of my Valiant for your Hemi. It gets 21 mpg all day long in town.