Gas mileage on a 75 sting ray

About 18 on the highway with a smallblock. 14 or so city/highway combined. Less if you're only moving between traffic lights.

I drove my '69 to a cruise night last Saturday. It was almost empty, I added 5 gallons, drove 24 miles to and from and it's almost empty again. I guess that's about 5/24=.2 MPG. :surprised Your mileage may differ. (I hope it does).
But then again, I was on the gas pretty hard too. I really like hearing that BB talk to me.

:cheers:

6880 Mike said:

About 18 on the highway with a smallblock. 14 or so city/highway combined. Less if you're only moving between traffic lights.

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That's what my '72 L48 Muncie 336 rear vert got, minus a bit...2-3 mpg...and I can say the ONLY way to improve really significantly is/was to put a basic stock L98 DPFI sytem on there, and get a speed denisty computer set up for a MILD CAM, and obviously go closed loop, and have another ~80+ hp and see the fuel economy go to 24 highway...no lie, and about 18 around town....and I was going pretty good, around town....

BTW, that Qjet was in pretty good shap, good plugs, ran/idled smooth, not ruch, no smoke....everything LOOKED fine....
I guess maybe IF I could have gotten a wide band O2 sensor some 12 years ago, I could have played around to get it close to the L98 setup....


now I have a hotrod 355 mild roller, and lucky to push 20 on the highway....and frankly given the traffic/cops/idiots/etc....I wish I had a milder cam again....can't justify more bux out though to now REDUCE the engine power.....

75's between 12-15 MPG +/- 2

running a 275 HP crate engine that was already in my 74 when I got it. Rebuilt the Q-Jet myself and tuned myself.... last 100 mile trip on state highways not interstate I got 19 mpg. Interstate I actually get a lil better than that. in my smallish town i get around 14. I run a turbo400 tranny with a 2500 stall converter with 3.08 gears. :buhbye:

The best I got was with my 69, 350 4 speed 336 gear. Ran an SP2P intake stock 2" pipes, manifolds and a leaned out Q-Jet. Got 18-19 MPG at 65 mph.

TimAT said:

I drove my '69 to a cruise night last Saturday. It was almost empty, I added 5 gallons, drove 24 miles to and from and it's almost empty again. I guess that's about 5/24=.2 MPG. :surprised Your mileage may differ. (I hope it does).
But then again, I was on the gas pretty hard too. I really like hearing that BB talk to me.

:cheers:

Click to expand...

Your mileage isn't quite as bad as you think ...

MPG is Miles per Gallon ...

Since your went 24 Miles on 5 Gallons, then your MPG = 24/5, or about 4.8 MPG, not 0.2 MPG.

And you thought you were getting poor gas mileage! :laughing:

Steven

:spanked:

Fat fingers, when combined with posting prior to morning coffee, may cause errors in mathmatical calculations.

4.8 MPG?? :excited:

TimAT said:

:spanked:

Fat fingers, when combined with posting prior to morning coffee, may cause errors in mathmatical calculations.

4.8 MPG?? :excited:

Click to expand...

A guy in my old vette club had an L88, aluminum headed monster, drove it like a madman...got 5 mpg, then bitched about it....we all laughed our asses off about it....got you toes outta those secondaries you be getting better mileage....ya think??:crazy: :laughing: :rolling: :thud: :smack :cheers:

Sharks MPG

Both my totally original numbers matching stock 72 and 73 350's get about 16 MPG. They aren't driven hard but they are driven on a regular basis.

Crunched some numbers and it worked out to 8mpg. And thats "cruising" 55-65 on a two lane and 75-85 on the four lane highway to work and back.

before i switched engines my 77 got 12 mpg around town and about 15 on the highway