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Old March 13th, 2008, 06:34 PM   #1 (permalink)
ROCKET JO
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1985 delta 88 gas milage??

What kind of mpg should I get with a 1985 delta 88 307 auto fresh tune up low miles-40k ciry and hiway??
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Old March 13th, 2008, 09:38 PM   #2 (permalink)
J-(Chicago)
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20 highway
16 city.

about.
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Old March 13th, 2008, 09:40 PM   #3 (permalink)
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Let me know if you get or have this car.
I have had and still have many 80's Deltas.
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Old March 14th, 2008, 09:03 PM   #4 (permalink)
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I got about 16 city/hiway, before a tune up, after about 19 cit/higway, until I took out the 2.73's. But it still got around 15 cit/hiway with the 3.42's
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Old March 15th, 2008, 07:07 AM   #5 (permalink)
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I think that is reasonable mileage and decent for an older car. That is about what I was getting when I had a 90 Buick Estate wagon with the 307. It was essentially the same car as an 80s Delta 88, just a little bit bigger.
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Old March 15th, 2008, 07:13 AM   #6 (permalink)
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Yeah, mine gets about 9 mpg at the moment though, with the carb and timing the way it is.
I'll be on my 3rd rebuild this weekend.
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Old March 15th, 2008, 07:16 AM   #7 (permalink)
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J, don't forget to have the throttle plate bushings redone. You also need to seal up the bottom part of the jets with a fuel proof compound. Good luck. 9 mpg is a bit more normal for an older muscle car.
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Old November 22nd, 2008, 07:41 PM   #8 (permalink)
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wow i actually get 18 mpg city and 25 highway with my 1984 oldsmobile delta 88 307 v8
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Old November 23rd, 2008, 07:47 AM   #9 (permalink)
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Originally Posted by 84oldsDelta88 View Post
wow i actually get 18 mpg city and 25 highway with my 1984 oldsmobile delta 88 307 v8
Canadian gallons ,right?
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Old November 23rd, 2008, 03:29 PM   #10 (permalink)
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wow i actually get 18 mpg city and 25 highway with my 1984 oldsmobile delta 88 307 v8
What gears do ye in the rear? I'm guessing 2.56's
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Old November 23rd, 2008, 03:47 PM   #11 (permalink)
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My 1985Buick Rivreia , that has a 307 OLDS motor- get about 24mpg
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Old January 28th, 2009, 08:32 PM   #12 (permalink)
84oldsDelta88
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no its u.s. and it was a type not 25 highway i wish i think im around 22-23 still ok for a v-8



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What gears do ye in the rear? I'm guessing 2.56's
im not sure. im still trying to figure out my tranny the shifter indictactor is PRND2L but i clearly hear 3 shifts 1st to 2nd 2nd to 3rd 3rd to 4th so if i do have a 4 speed it would be the th 200-4r with OD. but wheres my OD selector on the dash? unless the previous owner changed the transmission without changing the gear selector. is 2.56 the stock differentail?
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Old January 29th, 2009, 06:46 AM   #13 (permalink)
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The 3-4 "shift" you hear may be the torque converter solenoid kicking in at about 40-45mph. My 86 Cutlass with a 307 does this, but I do have the OD tranny. Almost feels like a "5th gear". 18 city and 25 hwy is about right for mine.
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