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Gas mileage question

T

tom94vette

Guest
Hey guys and gals,

My 94 Automatic with 51K miles on it runs perfectly. No hesitation, starts up in a split second cold. Just runs great. I just changed my air filter about 8k ago so that should be ok. I do ALL city driving in south florida. So it's all stop and go. Rarely do I get on the highway. Only because I use my vette during the week to go back and forth to work, then use the Motorcycle on the weekends. I put all my highway miles on that.

Anyway, according to my computer, my car is averaging 15.2 mpg. Is this accurate. Can I really be getting this bad of gas mileage? Is this normal, no cause for alarm. I really never paid attention to it before so I can't really tell if it's getting worse. What is everybody else averaging in the city?

My manual says that that plugs don't need maintainence until 100K but personally I find that impossible to believe. Should I change them now at 51K and will that improve my gas mileage.

So my questions are..

1. Is my car getting poor gas mileage at 15.2 avg city mpg?
2. should I change my plugs at 51K now or wait til 100k?
3. How can I get better gas mileage in the city, if possible?

p.s. remember, I do no highway driving.

Thanks everyone.

Tom
 
V

vent69

Guest
i get around 12-13 in the city if i'm lucky

i also need more mpg
 
C

c4ever

Guest
Tom,
On my 85, driving the same roads as you, I get a little over 19 with some mods. Prior to the mods I got 22 or better with this type of driving. Seems 15 would be a little low. I realize we don't run the same engine but that's a heck of a difference in MPG.:confused
 

Redbob

Well-known member
Joined
Dec 5, 2001
Messages
239
Location
Cross Roads, Texas, U.S.
Corvette
'89 dk red coupe
15 mpg city traffic is perfectly normal; mileage doesn't really get good until you're above the torque converter lock-up speed, which is 37 MPH in my '89 w/ 3.07 gear.
But 51k miles is plenty on a set of plugs! By that mileage mine needed new wires, too. Made a big difference in performance, not much difference in gas mileage.
 

jjones

Well-known member
Joined
Nov 22, 2001
Messages
101
Location
Fort Lauderdale
Corvette
1992 black coupe, six speed
Tom - I tend to agree with c4ever. Same S. FL roads and I am getting nearly 18 mpg consistently. And I can really slam through the gears.

jj
 
V

Vdaddy

Guest
Tom,

I've got a '93 with a 6-speed that gets about 17 - 18 in city driving, with only occasional romping. It's affected a lot by how hard you drive it.
 
R

resto75

Guest
My 94 averages 15/17 on computer on rural county roads with 3.73 rear driving normal
 
F

FX3FX3

Guest
miles

i guess normal, I get 15-17 MPG city with my 92 automatic 2:59
 
W

wookiebear

Guest
Milage

I have a 96 LT 1 convertible, I average 16 to 17 in the city and that is with a few jackrabbit starts, I have 3:07 gears, with a few performance mods such as K&N filter and box, modified Granetelli MAF, Air Foil and bypass with HPP programer. Car is also Automatic.
 

fixvet

Well-known member
Joined
Apr 4, 2002
Messages
139
Location
Clever, MO
Corvette
1998 Two Tone Torch Red& Black Coupe
With my '88 coupe, I've never gotten less than 18mpg in normal city driving around San Diego county, but my hiway crusin' mileage at 75-80 mph is always 25-27 mpg on longer steady trips on the interstate roads. This seldom ever changes. Just rolled over 157,000 miles. Automatic w/2.59 gears. I love it!!:cool
 
E

evolution

Guest
17-19 City 25-30 Freeway AVG

I dont know why I gat such good milage on the freeway but I do.
Actually I get better milage at 75 than I do at 55-65.

A funny thing. I was reading motor weekly or something like that, the name escapes me, and they had a WRX and a ZO6 on the same page saying they averaged 22mpg on the WRX and 23mpg on the ZO6. Imagine that, a 405 HP beast drinking less than a stock supercharged 4 banger. Food for thought.

Be environmental....buy a ZO6!
 

jsinga

Well-known member
Joined
Nov 23, 2001
Messages
280
Location
Savannah, GA, USA
Corvette
87 Silver Coupe Way over 200k miles
I think your milage is about what you can expect doing a lot of stop and go driving.
Leave for work earlier so you don't sit in traffic so much is about you can do.
Plugs might make a slight difference if they have 50k miles on them. Don't be suprised if you can't tell any difference after they are changed.

JS
 

Edmond

Well-known member
Joined
Aug 1, 2001
Messages
5,218
Location
Louisiana
Corvette
2003 Z06
A tune up will probably increase your mileage just a little bit more. I also use that fuel injector cleaner stuff in my gas tank about once a month. I just leave the digital reading on avg. and I got a high of 16.8 and I don't drive on the expressway much.
 
D

Drewser

Guest
17 or so in the city (15 if I pound it...I usually pound it) and 21 or so on the highway...more or less
--Drew:w
 
T

TomsToy

Guest
Milage

I'm getting 17-19 in town & 23-24 on the hiway, and that's running "several" MPH above the limits.
Tom
 

Paul G

Well-known member
Joined
Aug 27, 2001
Messages
200
Location
Griffith, IN, USA
Corvette
96 CE LT4 Convertible
City driving all the time is the worst thing for mileage. Not much you can do about that.

Also keep in mind as an oxygen sensor wears out mileage will be affected. You could take it in and have it checked. Or just replace it and see what happens. Really I dont think 15 mpg all city is that bad.
 

Red73BB

Well-known member
Joined
Jun 15, 2001
Messages
241
Location
Defiance, MO
Corvette
1969 dark red convert
mileage

I get about 10 mpg no matter what, city, highway, heavy foot or just cruising. 454 w/ 425 hp.
 
D

Drewser

Guest
Simple Math

Lets see...twice the horse power and half the gas mileage. Yeah, that seems about right to me.:D
 

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