Mpg
Intermediate
Joined: Jul 2004
Posts: 26
Likes: 0
From: Heath Ohio
I was trying to find out what gears are in my 99 coupe, 6spd. From reading some of these replies it looks like maybe 3.42??? Does the owners manuel have this info? Where does one find these things out. Or is that the only gears the 6 spd came with???
Melting Slicks
Joined: Jul 2004
Posts: 2,340
Likes: 35
From: Folsom Lake CA
Maybe my DIC is wrong but my average always says 16.4 - 16. 9. Mostly city driving in an MN6 with Halltech Stinger and no other mods. Either most of you who posted here always drive mellow and slow on the highways, or my handle is only too true. But, it's only a name, I swear. 
Last edited by MrLeadFoot; Sep 1, 2004 at 01:20 AM.
Team Owner
Joined: Aug 2004
Posts: 24,129
Likes: 1,038
From: The Beautiful Pacific Northwest
St. Jude Donor '05-'06-'07-'08-'09, '14-'15-'16-'17-'18
Just over 31 mpg in my A4 on the highway and about 21-22 around town. Waaaay better than my 5 liter 200 hp '91 Firebird. Amazing how much more power comes from a much more economical (gas wise) engine... 
Racer
Joined: Jul 2003
Posts: 460
Likes: 0
From: N. Potomac MD
Real or Not
I also get indicated average real world Washington Beltway Traffice milage about 28 but when dividing miles by gallons I get 26. I don't think the display is all too accurate. BTW the BTU content of premium verses regular is identical and as such premium will not change gas milage when driving steady state speeds.
Melting Slicks
Joined: Jul 2004
Posts: 2,340
Likes: 35
From: Folsom Lake CA
I just got back from a ride and fill-up. Using my trip meter, which I always reset at fill-up, I calculated that I am indeed getting pretty darned close to what my DIC reads - 16 mpg city.
Now, I also made a special trip on the freeway at 10 miles over the posted 65 speed limit during the ride, and do in fact see that if I were to drive that way ALL the time, I would indeed get in the 20's to low 30s in mpg. But, come on, let's be serious, who in their right mind drives within 10 mph of the speed limit on freeways? People in Ford Focuses don't even do that.
So, I am shocked and somewhat insulted to discover that I'm the only one on this thread who appears to drive "normally", let alone "use" my C5 the way it was designed to be used. So please, don't make us all look like old fogies and drive your C5s once in a while, will ya?
Now, I also made a special trip on the freeway at 10 miles over the posted 65 speed limit during the ride, and do in fact see that if I were to drive that way ALL the time, I would indeed get in the 20's to low 30s in mpg. But, come on, let's be serious, who in their right mind drives within 10 mph of the speed limit on freeways? People in Ford Focuses don't even do that.
So, I am shocked and somewhat insulted to discover that I'm the only one on this thread who appears to drive "normally", let alone "use" my C5 the way it was designed to be used. So please, don't make us all look like old fogies and drive your C5s once in a while, will ya?
Last edited by MrLeadFoot; Sep 1, 2004 at 07:15 PM.
Safety Car
Joined: Jul 2001
Posts: 4,661
Likes: 67
From: Ocean Springs MS
Originally Posted by Jackyl99
I was trying to find out what gears are in my 99 coupe, 6spd. From reading some of these replies it looks like maybe 3.42??? Does the owners manuel have this info? Where does one find these things out. Or is that the only gears the 6 spd came with???
http://corvetteactioncenter.com/specs/1999/index.html
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Instructor
Joined: Jun 2004
Posts: 218
Likes: 0
From: Escondido CA
22 mpg mixed city/highway in San Diego, with many hills -- anything but level driving drops your fuel ecconomy like a rock and I don't have a lead foot.
The truly impressive thing is that my c5's MPG is better than all of my other vehicles (Accord V6, Subaru WRX, Ford Club Wagon, Pontiac Gran Prix, Ford Bronco).
The truly impressive thing is that my c5's MPG is better than all of my other vehicles (Accord V6, Subaru WRX, Ford Club Wagon, Pontiac Gran Prix, Ford Bronco).
Burning Brakes
Joined: Jan 2004
Posts: 1,135
Likes: 0
From: "Land of Mojo" Toms River NJ
Cruise-In IV Veteran
I've got a worked up cam, custom computer tune by the Vette Dr., custom ported LS1 stage III heads, averaged 70 MPH and got 28 mpg on the way back from Carliale this weekend, and average 20.3 mpg local driving.
Racer
Joined: Oct 2001
Posts: 385
Likes: 3
From: Lincoln CA
I'm not sure what my problem is.
When I bought the car ('02 Z06) in Sept of '01 we drove it from NCM to northern California. Got 36mpg average most of the way during the breakin, going slow, no hard acceleration, etc. Then the rest of the way got about 32mph.
Now I have a 160 thermo, fan controller, Halltech TRIC and '01 MAF (with screen to help with the surging from the TRIC.)
Dropped to 21-22mpg on the highway doing 55-65mph (where I used to get 28+.
Put it on the dyno stock and was at 11.5:1 AFR, pretty rich. Put NGK plugs, GMPP wires, 160 thermo, fan controller and got 10.5:1 AFR... really rich. Then put the Halltech TRIC and '01 MAF on and off the dyno chart at 9.9:1 AFR... WAY rich...
Also had a local tuner try dyno tuning and couldn't get it to go into power enrichment mode... Figured out the '01 MAF must have a different calibration or something???
So now going back to stock, try tuning again, and then mod with 180 thermo, Haltech TRAP, LG headers, cam, Borla Stingers, etc.
Also, on a cold night with the 160 thermo my engine ran at 167*... WAY too cold for good MPG and emissions.
When I bought the car ('02 Z06) in Sept of '01 we drove it from NCM to northern California. Got 36mpg average most of the way during the breakin, going slow, no hard acceleration, etc. Then the rest of the way got about 32mph.
Now I have a 160 thermo, fan controller, Halltech TRIC and '01 MAF (with screen to help with the surging from the TRIC.)
Dropped to 21-22mpg on the highway doing 55-65mph (where I used to get 28+.
Put it on the dyno stock and was at 11.5:1 AFR, pretty rich. Put NGK plugs, GMPP wires, 160 thermo, fan controller and got 10.5:1 AFR... really rich. Then put the Halltech TRIC and '01 MAF on and off the dyno chart at 9.9:1 AFR... WAY rich...
Also had a local tuner try dyno tuning and couldn't get it to go into power enrichment mode... Figured out the '01 MAF must have a different calibration or something???
So now going back to stock, try tuning again, and then mod with 180 thermo, Haltech TRAP, LG headers, cam, Borla Stingers, etc.
Also, on a cold night with the 160 thermo my engine ran at 167*... WAY too cold for good MPG and emissions.
Drifting
Joined: Jul 2002
Posts: 1,890
Likes: 1
From: Indiana
St. Jude Contributor
I did one 120 mile trip @ 65 on cruise ONE TIME........about 35MPG......most of the time I'm around 28 on highway.
Drove 875 miles to Fla. once....and I'm usually in 4th or 5th through the traffic.........and still got over 24.
I love it when you tell people your 175mph car gets 35mpg if you want it too !!!!!
Drove 875 miles to Fla. once....and I'm usually in 4th or 5th through the traffic.........and still got over 24.
I love it when you tell people your 175mph car gets 35mpg if you want it too !!!!!
Pro
Joined: Feb 2004
Posts: 638
Likes: 1
From: Bainbridge Island Wa
Mpg
I just completed a 6000 mile road trip with my 04 C5. I have 3.15 rearend and automatic. On my trip I averaged 28.5 on two lane, four lane and I ran it around 80 - 85 mph with cruise on and off. I was on straight highway and in the mountains. The gas mileage is better than I get with my Lexus GS...I can see that I was not only surprized at the mileage, but it was sooooooooo funnnnnnnn. I never got stuck in a line of motorhomes...winks...!!! 
Melting Slicks
Joined: Jul 2004
Posts: 2,340
Likes: 35
From: Folsom Lake CA
Originally Posted by Nitro Junkie
I have MN6 and 3.42 rear. At 80 MPH in 6th, DIC shows 31.5 MPG. At 100 MPH in 6th, DIC shows 24.5 MPG. Average on DIC is 24.5 MPG.
Last edited by MrLeadFoot; Sep 2, 2004 at 12:12 AM.
Melting Slicks
Joined: Apr 2004
Posts: 2,547
Likes: 0
Originally Posted by BWP 5P
I did one 120 mile trip @ 65 on cruise ONE TIME........about 35MPG......most of the time I'm around 28 on highway.
Drove 875 miles to Fla. once....and I'm usually in 4th or 5th through the traffic.........and still got over 24.
I love it when you tell people your 175mph car gets 35mpg if you want it too !!!!!
Drove 875 miles to Fla. once....and I'm usually in 4th or 5th through the traffic.........and still got over 24.
I love it when you tell people your 175mph car gets 35mpg if you want it too !!!!!
