I have a 69 plymouth fury sedan 2 barrel 318 automatic all original except for tune up parts and 3 inch exhaust. Going to be taking it on its first 200+ mile trip. What is the best cruising speed on the highway for the best gas mileage? What is the average gas mileage to expect? thanks

 

55-65 MPH
10 MPG city
14-16 MPG Hwy

Have fun be safe....
Keep us posted on how close we are....

 

Thanks. Will do!

 

What ever you can get away with !!! Why worry about the gas mileage ! If you are concerned about the mileage drive a Neon

 

Come-On Lynn.... Take a stab at it.....oke:

 

before i was driving my dad and i was looking at Imperials 1963. my dad ask how much MPG does it get? " if you can afford an Imperial you wont worry about MPG"

 

Some claim 20 mpg but I don't believe them !! My Dad almost always drove those 500 ci caddies. He had a 64 Buick Wildcat 4dr I wouldn't mind having one today. It was a very unusual car 4dr Buckets, floor shift auto, center consul. As kids we drove from LA, Ca to NY and back probably averaging 80 mph

 

Hahahaha... My Mom Loved Caddys Also..... I got dam good with 472's and the 500 inch motors..... RWD and FWD.... Dam I feel old, My bone i'm talking about...lol

 

I've seen 318s get 20, and have heard outlandish claims

I put a 71 340 into my '70 sixpack RR body in about 73 or so. So this is a heavy car, Dana 3.54, A833, "hang on" after market A/C. It would get an honest 17.5 on the highway. I was not all that careful a driver. When I "got on" the freeway, I GOT ON the freeway.

Engine photo is right after it was installed. I was broke, and had no money for "chrome." Next is young skinny little me

Bottom photo is before I owned it. My good friend George, who had just trophied in pure stock probably at Lions. I bought it from him with 35K on the clock. The original engine broke the no6 rod, broke the cam (in about six pieces), drove valves through pistons, and a rod out the block. I removed the intake, distributor, valve covers and threw the rest in the garbage.

My leading chief liked to do a Columbo impersonation, and I don't even know if Columbo was on the air then. Chief would knit his eyebrows, frown in concentration, and they say "I do have one question?" "Are ya sposed ta be able ta look down into the engine and see the GROUND!!!?"

Putting the 340 in was interesting, because only 318s came in 70 B bodies. The mounts are a little different, I had to use 318 single exhaust until I could afford headers, and had to turn the bell register larger for the 18 spline retainer. This was before "Al Gore invented the internet."

https://moparforums.com/forums/f62/m...-back-day-596/

 

i got a steady 18mpg with my 318, and that's with a 4 barrel. i didn't keep my foot out of it much, either. it's definitely possible.

 

Well just a little update. Filled it up until it clicked then hit the road. Went 111 miles. Took 4.97 gallons to fill it back to click off so 111/5= 22.2 Still got 200miles to go so I will repost.

 

Bought all original with 28,000 miles. I have 31,000 on it now. Only replaced tires, shocks, motor mounts, belts,exhaust.gas tank floater.

 

.... Your going to have to put your foot in it a lot harder to get worse gas mileage than that !!!!!!!!!!!!

Good for you... I bet that feels great? How dose it drive out on the open road for you?

Good Looking car for its age... Well taken care of......

 

With new shocks and tires it just glides on the highway. Did a little stop and go in a few little towns. But as of 315 miles I am at 18mpg

 

Nice....

 

3"inch exhaust?