I'm hoping that the mileage I'm getting on my stock 82 is not normal and I can fix it.  First I need to know what is normal.  I would bet there are others that would like to know this also and I know that it was done years ago.   Did they post mileage on cars when C3's were new?  I do not think so but if so does anyone have that data?

If you please could we have what you are running and if it is not basically stock what you have done that could affect mileage, what the car is, freeway-open road mileage, Mostly in town mileage, 50/50 Normal mixture of in town and road.

Corvette configuration:  82  stock auto transmission
Mileage Freeway: 12 mpg
Mileage in town: unknown
Mileage 50/50: 11mpg

I have a '69 427/435...3 carburetors, M21 transmission, L88 camshaft, 4.11 rear axle.

 Basic stock 350. M-20  3.36 rear.  The trip to Effingham bout 12-13. Did an adjustment on carb on the road, then got 18-19 rest of trip. Home on the hills, bout 15-16.

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Have never done much around town driving to check it, but my basically stock 79 L48 with the 3.55 rear gets about 14 mpg on the highway. It's good to have a 25 gal. tank, though!    

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"Down on the Boardwalk...

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Hi Gilbert,

I got 18.5 MPG on the last road trip (220 miles or so) at 70-75 MPH.  That is before the new plugs.  The next tank will give me mostly around town numbers. Update:  Around town the next tank gave me 16.25 MPG.  Around town is really 65 MPH for 25-30% of the time and Stop and go fast for the rest..... I found the timing was set for 12* and I just reset it to 10*. It runs a bit hotter now but, seems smoother getting to 40-50 MPH.

82 CFI only mod is a 85 higher pressure/flow fuel pump.  59,000 miles

This is my original EPA sticker info: Click link for larger version.
http://209.200.117.236/member_uploads/14401_14500/14492/82CFI_EPA_STICKER.jpg

kwoody2011-07-24 08:20:47

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Nobody ever waves when I'm driving the Explorer.
K Woody

[QUOTE=kwoody]

[/QUOTE]

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LIFETIME MEMBER 151

My 82' CE is stock and numbers matching.   This is with my driving techniques.

14-16 is an average on my 74 L-82 4 speed.  I stick around 70 on the highway on trips

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I wanted a Corvette my whole life, but I never dreamed of all the wonderful people I would meet because of it!

Stock '82.

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When I had the stock Cross-fire I got about 25 highway, around 70 mph. Around town I got about 17. With the new ZZ4 engine, 3.55 rear, I get about 20-21 highway and about 15-16 around town. Your's is way off the mark. Hope you find whats causing the low mileage.

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Lifetime Member #116
Dave's '82

   

Ive never driven mine on an extended road trip (perhaps the next C3VR gathering ) but around town Im getting between 17 and 18mpg.  Stock crossfire except running 85 fuel pump with a regulated pressure of 14.5 psi.

 GREAT post.  Sounds like our numbers are pretty consistant. I have been wondering how I compared to the other drivers. THANKS for putting it up.

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When we get some more I will put them all in a list so it will be easy to digest.  Then I'm going to be asking for ideas on why mine is so bad.  But that is another post question.

Thanks for all of the inputs so far.  I know there are others out there for other years just send them in and I will put them together.  When this falls off the 24 hour list.

For those of you with smartphones, check out an app called "FuelLog." 

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-Adam Wartell
NCM Lifetime Member #1222
Founder: C3 Vette Registry 
C4 Vette Registry, C6 Vette Registry

My first Vette, now owned by JB79:

[QUOTE=Adam Wartell]For those of you with smartphones, check out an app called "FuelLog."  [/QUOTE]

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LIFETIME MEMBER 151

The '74 gets around 16 if I treat it nice on the road...which I usually do NOT. 70-75mph anywhere I'm headed...end of story. So...my real mileage is closer to 12-14mpg.
The '85 will cruise all day with the A/C blasting, 70-75mph, and get 25-26 mpg.


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Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

Ive only checked mine one time and that was last fall. I was happy as can be when I found I was getting just over 19. I checked it twice during that trip just to make sure. I still have trouble believing it. 350 bored .030 with small cam, edelbrock 2101 intake, Summit heads, Factory quadrajet, Headers, 400 turbo trans with 308 gears.
Rodney


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[QUOTE=rod7515] ...with 3.08 gears. [/QUOTE]

And there you have it!


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Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

My 72 stock 350 with TH 400 auto always got about 15 HWY and considerably less in town.
A few years ago I installed a HEI distributor and upgraded plugs and plug wires.
On the 900 + mile trip to Effingham last May, I averaged a little over 17.  I was really surprised.
Didn't think it would make that much difference.

Dean


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[QUOTE=dwright]Stock '82. [/QUOTE]
have I told you lately that I hate you, Dave?


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Jeff,

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Since putting the 700R4 in, we run anywhere from 19 to 27 mpg (Effingham trip) depending on how "bad we treat her", as Joel said.  55 mph on the highway yielded best results.  Before the 700R4...15-16

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  LIFETIME MEMBER # 191

Hey Barb, don't you just love that first gear!

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Lifetime Member #116
Dave's '82

   

exactly the same as my 74 4 speed, just ran with it last week and was happy with 15mpg @ 70-75.

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Lifetime Member #36

click on any image for a larger view

45 to 60 it's a hybrd.  sorry i just had too i will leave now

[QUOTE=DaveM]Hey Barb, don't you just love that first gear! [/QUOTE]

"Ruby" is my daily driver, and after the ignition upgrade, running on regular gasoline (87) I've had a chance to run several tanks of gasoline and she is giving me an average of 18 miles to the gallon. City and highway mix 50-50.  I can't wait to take a long trip and find out what she'll do on a highway cruise. TommySSE2011-07-24 22:38:45

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Tommy
1980 Project Corvette - (Need suggestions)
1982 "Ruby" (Ain't She Sweet!)

On the last trip to Effingham I managed almost 23 mpg @ 70 mph. I had to go this slow due to a nasty vibration. I love my Tremec 5 speed.

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GEN III 5.7L "LS6" Engine swap
TKO500 5 spd.

79 L-48 with 3.55 gears and 350THM auto:

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C3: 1979 Corvette Coupe, Auto, L-48, Red/Doeskin (my wife's fave);