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Old 06-08-2007, 07:13 AM   #1
TShark
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Gas mileage on a 75 sting ray

Hey all, I was just wondering if anyone knew the approximate gas mileage for a 75 sting ray (350 ci engine of course). I've recently started driving mine to work instead of my dad's ford van because of the insane gas prices. I know the vette gets better mileage, but I was just curious as to the actual numbers.
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Old 06-08-2007, 07:22 AM   #2
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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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Old 06-08-2007, 08:10 AM   #3
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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. 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.

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Old 06-08-2007, 11:34 AM   #4
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Quote:
Originally Posted by 6880 Mike View Post
About 18 on the highway with a smallblock. 14 or so city/highway combined. Less if you're only moving between traffic lights.

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.....
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Old 06-08-2007, 03:11 PM   #5
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75's between 12-15 MPG +/- 2
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Old 06-08-2007, 03:25 PM   #6
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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.
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Old 06-08-2007, 04:08 PM   #7
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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.
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Old 06-08-2007, 04:55 PM   #8
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Quote:
Originally Posted by TimAT View Post
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. 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.

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!

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Old 06-09-2007, 09:19 PM   #9
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Fat fingers, when combined with posting prior to morning coffee, may cause errors in mathmatical calculations.

4.8 MPG??
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Old 06-10-2007, 12:32 AM   #10
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Quote:
Originally Posted by TimAT View Post


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

4.8 MPG??
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??
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Old 06-10-2007, 02:43 AM   #11
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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.
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Old 06-10-2007, 07:31 AM   #12
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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.
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Old 06-10-2007, 07:36 AM   #13
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before i switched engines my 77 got 12 mpg around town and about 15 on the highway
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