E Bodies Gas Mileage

[7212Mopar]

Not that many of us care about gas mileage because most of us don't drive our cars on a daily basis or just don't care as long as having fun. However, it would be a nice piece of information for planning long trips or cruises. I just got my car running and fuel gauge is not reading right but it is burning gas quicker than my 2012 Challenger. I will fill in my share once info is available. So please share your info.

Engine size
Transmission
Rear gear ratio
Carburetor or EFI
Horsepower
City MPG
Highway MPG
Combined MPG

[Shane Kelley]

71 Cuda
340 with ported aluminum heads-11.0-1 compression
Real lumpy cam
750 mechanical secondary carb on a RPM Air Gap intake
400 hp
4 speed manual trans
3.91 rear gears with 26" tall tires
average 8 mpg
Real gas hog
Fixing to put a 6 barrel on this motor. Curious to see what that does for MPG. I'm thinking I will pick up some with a smaller 350 cfm center carb.

71 Road Runner
340 un-ported Edlebrock aluminum heads-10.5-1 compression
Pretty lumpy cam
650 Vacuum Secondary carb on a RPM Air Gap intake
300+ hp guesstimate.
Auto trans
3.55 rear gears with 27" tall rear tires
average 12 mpg

[Brads70]

451 stroker,Lunati hyd roller cam Mopar Stage 6 heads
4L60 auto OD
4:10 Dana rear end 27.2" tall rear tires
850 Double pumper
550ish? guessing never dyno'd

City..... never kept track , too busy playing with the loud pedal ( likely not good)
Hwy best was 17 MPG on the way to Carlisle  (Was slightly better with 3:55 rear gears)

[anlauto]

$40 per cruise night

[ledphoot]

Last time I kept track my Challenger with ~400HP 340 with .510 lift cam and ported X heads would average 12MPG and get as high as 15 mpg when I had the 3.23's in it.. It went down a little when I switched to 3.55's, but it still averaged about the same. Hoping for similar in the Cuda if I can keep my foot out of it.

[MEK-Dangerous]

I would think, even with a stock 318, you would be hard pressed to get more than 16 MPG on the highway with a carburated engine.

[chargerdon]

74 challenger 360 9.75 compression, Edelbrock air gap intake, 600 cfm eddy carb, 3.23 gears, 26" tires.   Average between 12-14 when i drive it like a daily driver.

around 8 when im having fun which is most of the time..   

[Fern]

It all depends on how heavy your foot is on the pedal.

[70/6chall]

1970 Dodge Challenger,
A daily driver (over 100 miles day, for 7 yrs) then about 45 miles a day for the next 25 yrs. 40k in 1972 to 522k miles in 2008 (retired from daily service in that rear). A very reliable and great running car. Just the usual mechanical fixes during that time.
   1.) 225 cu. in. Slant6, 3.7L
   2.) A904 w/ B&M shift improver kit
   3.) factory Super Six mods 2 barrel Carter BBD carb, cast iron intake, 14" open element K&N 14x3 filter
   4.) Mopar elect. ign. (Orange box)
   5.) Hooker 3into1 headers, real dual exhaust 2 1/4" aluminized pipe w/ "H" pipe, 2-26" Glass Pack mufflers to the back w/ bright tips (Cuda Style)
   6.) 8 3/4, 742 drop out 3.23 single track gear set, 11" brakes
   7.) factory 14" Rallyes on 60 series tires
   8.) 175-180 Hp about w/ mods
   9.) City MPG 18-19 on 87 pump gas no additives
   10.) Highway MPG 23-24 average
   11.) combined, not sure maybe 20-21, pretty good for carrying around 2800 lbs
No power steering, no power brakes, 11" all around.    Thanks,   Al

[GoodysGotaCuda]

Engine size - 5.7L
Transmission - T56 magnum, 0.63 6th
Rear gear ratio - 3.73, 28.5" tire
Carburetor or EFI - EFI
Horsepower - 360whp
City MPG - 18
Highway MPG - 23-25 (70mph)
Combined MPG - 20.5

I have very good highway range if I can keep it below 70. It really likes to cruise at about 83mph or so.

[7212Mopar]

451 stroker,Lunati hyd roller cam Mopar Stage 6 heads
4L60 auto OD
4:10 Dana rear end 27.2" tall rear tires
850 Double pumper
550ish? guessing never dyno'd

City..... never kept track , too busy playing with the loud pedal ( likely not good)
Hwy best was 17 MPG on the way to Carlisle  (Was slightly better with 3:55 rear gears)
[/quodte]

17 mpg big block is very impressive. I bet the OD helps a lot. I will see if I can fill up the tank this weekend if the rain stops. I got a funny feeling mine is going to be less than 10.

[Brads70]

451 stroker,Lunati hyd roller cam Mopar Stage 6 heads
4L60 auto OD
4:10 Dana rear end 27.2" tall rear tires
850 Double pumper
550ish? guessing never dyno'd

City..... never kept track , too busy playing with the loud pedal ( likely not good)
Hwy best was 17 MPG on the way to Carlisle  (Was slightly better with 3:55 rear gears)
[/quodte]

17 mpg big block is very impressive. I bet the OD helps a lot. I will see if I can fill up the tank this weekend if the rain stops. I got a funny feeling mine is going to be less than 10.

Neil has built engines with same or more power that get better fuel mileage.  Maybe he will chime in on this.

Sent from my SGH-I317M using Tapatalk

[b5cuda]

That's impressive Goody - did you keep or disable the MDS feature on your 5.7?

[blown motor]

340/904
Lumpy cam
650 Eddy
3.23 gears
Guess about 325hp
13-14 mpg
Fill it every 200 miles

[js27]

440 punched .30 over
Auto
Lunati 507 lift cam
Edlebrock RPM manifold
Holly 750 dual feed -double pumper
Around 450 HP
3000 stall converter
410 gears
27" Radials
Hooker headers
MSD pro Billit Dist. and Blaster Coil with MSD 6A box
10 MPG city-highway.