Auto trans MPG

[resto75]

I'm curious to what kind of gas mileage other c4 autos are getting in town and on the highway. Also include your rear end ratio.

I get about 16.4 avg miles in town and avg 16.9 on the highway at 80 mph steady speed. This is with a 3.73 rear. I would get better at 70 mph but haven't really cruised at that speed much.

I would like to know what a auto with a 2.59 and a 3.08 would get.

 

[ErnieN85]

1985 3.07 gears
Highway 23.9
town & highway 17.4

 

[Mad-Mic]

2.59 87 stock coupe

19 city 23 highway

 

[TONY TAT2]

23/25 IN THE 85 & AROUND 8 IN THE 78 CAUSE IM "ALWAYS INTO IT"

 

[RoyalViking]

On a 550 mile trip from Sturbridge, MA to Pittsburgh, PA I averaged 27 mpg there and 28mpg returning. Commuting to work in traffic on the highway 50 miles each way I was averaging 26.5 mpg. Speed was in pace with traffic.

I don't know what I may get in the city.

 

[Edmond]

Auto 2:59 I'm averaging 16.7. While cruising on the highway, I've seen it at 32 mpg (when switched to instant), but I don't drive that fast for too long is a distance. I don't really drive on the highway much, all my driving is local suburban so I don't have to fill the tank up much.

 

[jstkrsn]

Mileage

Took a trip in my 86 from LA to Phoenix years ago, averaged 29 mpg w/2.59. Got 16-17 around town with foot in it. Haven't checked my 92. Didn't buy it for mileage.

 

[compyelc4]

'95, 3:08 auto, 20k Between 21 and 22.5 around town only. Dayton, OH to Bowling Green and then Nashville (interstate and around town cruising)... about 24.5 avg. Steady state interstate with 1 passenger and a crap-load of luggage....about 27-34.

 

[Moffitt]

My 86 with 3:07's gets 18 in town and 27-29 highway.
My 94 with 2:59's gets 18-19 in town and 28 at 75.
Both beat my Japanese car on the highway!

 

[93 RRR]

93 auto vert with 3.73 rear and get 17 in town (usually under 80mph) and 22.5 on the highway at 80 (while looking out for Johnnie Law)...
________________

JH
Ruby Red Roadster
3.73, Doug Rippie Chip & Air Suspension
Foil, K&N

 

[FrankM]

I have cruised the Interstates days on end for 27-29mpg.average. Cruise set at 68MPH.

 

[vigman]

88 Auto 2.59 well tuned

Mods hypertech chip, Dyna Coil. other than that ....bone stock

132K miles

16.5 city 22-24 highway 350 ish miles per tank ( and the SECOND it hits reserve I fill up)

I usually put about 18.5 gallons in but the tank is SUPPOST TO BE a 21.

Vig!

 

[vms4evr]

92 auto w/3.54 gears. 17-18 in town. 20mpg highway commute (this is mainly what i do). That is running about 2500rpm / 72-74mph on average. If you're running 80mph with those 3.73 gears that's where your gas mileage is going... I've noticed mine gets a fair bit more thirsty running 75-85mph. Around 72mph it seems pretty reasonable. I've done a round trip 300mi run driving easy and squeezed 23mpg for the trip. But that is babbying it...

The gear swap cost me about 1-2mpg on average. Then again you didn't swap the gears for better mileage :L

Graham

 

[resto75]

Graham

I think your right about that 80 mph mark. If I run at 70 the mileage really improves. I need to do a extended ride at 70 and see what I come up with. I bet it will be more like 19/20 mpg.


But then again your right 3.73's aren't meant for the the mileage

 

[vms4evr]

Roy,
You should see a difference. I went with 3.54 instead of 3.73 because I'm on the highway so much. I calculated a cost of about 150rpm at 75mph for 3.73 over 3.54. There is some error in the gauges versus pluggin the numbers into a formula. The formula tells me 75mph@2430rpm. When my tach says 2500rpm the speedo says 72mph. So if you run right at 70mph for a distance you should be under 2500rpm. Sometimes just for fun I leave it in D and run the highway. Gets it solid into about 3500rpm. It's really snappy kicking the throttle, but I'm sure the gas mileage goes right down the toilet ...
Graham