What MPG are you 340 guys getting?

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340Dust-her

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I'm seeing whether my 340 duster would get some decent mpg since it's coming along together. Nothing crazy, other than a stock 68' 340 with edelbrock performer intake/600 carb, rebuilt 904 transmission. I honestly forgot the gearing in the rearend, but its in the vicinity of 3:4's. Since it is a 3 speed, think it's possible to get at least 18mpg on the highway?
 
I have a stout 360 (~370 HP) in y 68 Barracuda with an A833OD and 3.55 gears. I get 17-18 mpg around town and 21-22 mpg on the hiway.
 
Can't say a 340, it's a 360. Got 20 MPG on the highway this weekend.

XE268H, LD340, Holley 750 DP, 2500 convertor, 2.76 gears, Dougs headers.

Probably got a bit more in it with a jet change. It runs a bit fat now.
 
68 340 with headers and edelbrock 600 no other changes from stock, 727 trans with 3.21 gears out back gets 18+ cruising 65-70mph on the highway.
 
I would imagine the parasitic loss would be significantly less with the 904 which would be better for mileage.
 
crackedback said:
904 takes less HP to drive than a 727.
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Meant to stop by and say howdy on Saturday, Rob, but you seemed to be consistantly busy with customers.

Sunday was just too busy for me. Damn, I missed the car you drove Sunday. I ended up driving away with another Duster on Sunday.

Anyways, my 340/727 combo with 3.23s in my Cuda will pull 17-18 on the highway turning 3K.
 
I got 13.5 on my way to the spring fling this year. Stock 340 3.23's with a 25" tall tire going 70 all the way.
 
5 gallons will make about 7, 1/4 mile passes and of course the trips down the return road and to the staging lanes....so thats about 0.7 MPG.
 
my 340 4 speed with 3.23 in my 67 Dart was about 14 mpg with a 650 edelbrock carb & 10 mpg with 700 dual line double pump holley

for 17 years I owned a 72 Challenger with a 340, 4 speed 3.55 gear and L 60 15 tire and it got about 17 MPG

I had a 77 Aspen T Top, 360 auto and the Challenger at the same time. I drove the Challenger most of the time cause I like the 4 speed and the MPG was almost the same.
 
Old thread but I thought I'd add my input. Currently running a warmed over 340, mild cam aluminum heads etc. My biggest change was adding a holly sniper. I have 392 rear and a torque flight 727. I'm lucky to get 8 miles per gallon. I think that the sniper is adding more fuel than it should. But my spark plugs look clean. I'm hoping that once I swap over to a Tremec 5 speed I'll see a little improvement on MPG.
 
jcolman said:
Old thread but I thought I'd add my input. Currently running a warmed over 340, mild cam aluminum heads etc. My biggest change was adding a holly sniper. I have 392 rear and a torque flight 727. I'm lucky to get 8 miles per gallon. I think that the sniper is adding more fuel than it should. But my spark plugs look clean. I'm hoping that once I swap over to a Tremec 5 speed I'll see a little improvement on MPG.
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Anytime you can overdrive it, it’s a good thing for mileage. You may not gain a whole lot but in the seeking mileage game, it’s the little things that get the last little bit that add up. Keep seeking!
 
dgc333 said:
I have a stout 360 (~370 HP) in y 68 Barracuda with an A833OD and 3.55 gears. I get 17-18 mpg around town and 21-22 mpg on the hiway.
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Similar except I have a regular 833. Also have 3.55 gears and about 370HP. I'm at about 12 in town and about 16 on the highway.
 
An 800 or 850 Thermoquad will pounce all over that 600 and get better mileage doin it.
 
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