Slant 6 225 fuel economy

[williaml]

All,

I have a 1965 Dodge Dart with a rebuilt engine and transmission. New fuel pump. Gas tank, filter, car runs great but uses a lot more gas then what I think it should. Is there an adjustment that can be made, I get about 200 miles on a tank of gas. Any suggestions would be helpful.

Thanks Bill

 

[joel d. snyder]

i feel your pain. i'm running a / with 43k org. miles & get 17 mpg consistently.

 

[805moparkid]

what carb?
timing curve? initial timing?
Vacuum adv working? diaphram broke causing a vac leak?
what are the valves adjusted at?
what is your normal rpm driven at? 45mph,55mph 65mph?
heat riser in exh manifold working at at least not closed?
running points?

 

[64DartGTinAZ]

Huh, I got all the way from LA to Phoenix with less than 1/4 tank in my /6 Dart Wagon when I picked it up

;-)

 

[Rockerdude]

I think a good running slant in the best stock conditions with an auto trans stock carb/exhaust will pull 20mpg at the most. Add a 2 barrel, better exhaust and an od trans and it helps out a lot.

 

[805moparkid]

I think a good running slant in the best stock conditions with an auto trans stock carb/exhaust will pull 20mpg at the most. Add a 2 barrel, better exhaust and an od trans and it helps out a lot.

25mpg at the most so far is the best on .org with stock stuff... 20 is average for a good running and tuned motor. but 200 miles is about 16 mpg

 

[Darter6]

Aha, What you west coast guys forget is the hills,dips, twists and turns that they have for roads in parts of the east.I grew up in a town back there that was all hills.Our 70 Swinger at best got around 14 mpg.Like Kid and Rocker about the best I ever got with my Valiant out here was about 20 on a road trip and 15 in town. The two reasons they discontinued the slant,fuel economy and EPA smog.Couldn't clean them up enough.The overdrive stick cars got better but not by much.

 

[C130 Chief]

My 65 with well worn (250K+) 225 consistently got 22 MPG in mixed city/highway. According to my parents, that was what it got since they bought it near new.