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#1371196 - 01/16/08 10:44 PM Re: gears & mileage [Re: psucrownvic]
P71CVMAN Offline
Over the Hill

Registered: 07/09/07
Posts: 4840
Loc: wIScONSiN
 Originally Posted By: psucrownvic
Hmmm, I believe mine has 2.73. Maybe thats why I am getting close to 20mpg city/highway combined?


If you have a '98 CVPI you should have 3.55 gears.
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Need new ride!!! Old ride: '01 Vomit Comet w/128K miles!
Best 1/4 mile pass: 14.774 @ 94.09 w/2.256 60' time!

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#1371210 - 01/16/08 11:00 PM Re: gears & mileage [Re: Carkid1989]
kustomizingkid Offline
Poobah

Registered: 11/18/06
Posts: 5070
Loc: Minnesota
 Originally Posted By: Carkid1989
2.73 gears? What kinda mileage with that? Best gearing for maximum highway mileage?

Thanks


2.73's are highway gears, cruising at speeds of 60-70mph you will be getting fairly optimal milleage. Some mebers have reported 26+ mpg highway.
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2000 CVPI 121,000 miles

1998 Mark VIII Collector's Edition 110,000 miles


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#1371213 - 01/16/08 11:02 PM Re: gears & mileage [Re: P71CVMAN]
PI Offline
Ryan #1
Grand Poobah

Registered: 12/03/00
Posts: 12205
Loc: When it rains, it drizzles
 Originally Posted By: P71CVMAN
 Originally Posted By: psucrownvic
Hmmm, I believe mine has 2.73. Maybe thats why I am getting close to 20mpg city/highway combined?


If you have a '98 CVPI you should have 3.55 gears.


Nope, 3.27. 3.55 was in '99, '00 and mid '01.
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- Ryan # 1


2009 CVPI
Ex Kirkland,WA Police
Dark Blue Metallic/Dark Charcoal interior
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LED CHMSL mod
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#1371243 - 01/16/08 11:23 PM Re: gears & mileage [Re: PI]
P71CVMAN Offline
Over the Hill

Registered: 07/09/07
Posts: 4840
Loc: wIScONSiN
 Originally Posted By: PI
 Originally Posted By: P71CVMAN
 Originally Posted By: psucrownvic
Hmmm, I believe mine has 2.73. Maybe thats why I am getting close to 20mpg city/highway combined?


If you have a '98 CVPI you should have 3.55 gears.


Nope, 3.27. 3.55 was in '99, '00 and mid '01.


Got my years messed up!! Thanks for clearing that up. -Nick.
_________________________
Need new ride!!! Old ride: '01 Vomit Comet w/128K miles!
Best 1/4 mile pass: 14.774 @ 94.09 w/2.256 60' time!

Exhaust/dragstrip videos

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#1371268 - 01/16/08 11:36 PM Re: gears & mileage [Re: kustomizingkid]
Ciffer Offline
Over the Hill

Registered: 05/16/06
Posts: 4366
Loc: Witchataw KS
 Originally Posted By: kustomizingkid
 Originally Posted By: Carkid1989
2.73 gears? What kinda mileage with that? Best gearing for maximum highway mileage?

Thanks


2.73's are highway gears, cruising at speeds of 60-70mph you will be getting fairly optimal milleage. Some mebers have reported 26+ mpg highway.


26+ should be very easy with 2.73s, considering i have no trouble getting 26+ with 3.27s at 65mph

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#1371281 - 01/16/08 11:44 PM Re: gears & mileage [Re: kustomizingkid]
JMSA540 Offline
Banned
Poobah

Registered: 05/30/07
Posts: 5776
 Originally Posted By: kustomizingkid
 Originally Posted By: Carkid1989
2.73 gears? What kinda mileage with that? Best gearing for maximum highway mileage?

Thanks


2.73's are highway gears, cruising at speeds of 60-70mph you will be getting fairly optimal milleage. Some mebers have reported 26+ mpg highway.


I'm one of those members. ;\)
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2000 Mercury Grand Marquis GS; 119,000 miles, 29 MPG highway/19.8 MPG city, 2.73 conventional rar, K&N Fuel Injection Performace Kit Cold Air Intake, K&N Performance Gold Oil Filter, Dual Flowmaster Super 44's, Goodyear GatorBack belt, 5W-20 Motorcraft semi-synthetic blend oil, Sylvania SilverStar Ultra's, 5% tint all the way around, ScanGauge II with X-Gauge. I'm selling my 1990 Ford F-150 XLT Lariat 4X4... PLEASE PM ME. https://www.crownvic.net/ubbthreads/ubbthreads.php?ubb=showflat&Number=1572213#Post1572213 Planning to buy a 2009 Ford Mustang GT. I LOVE MY FIANCE'! Matthew 21:22 wink

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#1371291 - 01/16/08 11:49 PM Re: gears & mileage [Re: Ciffer]
TechnoWeenie Offline
Banned
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Registered: 10/02/04
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I had an ex NYC taxi with 250K and 2.73's and got damn near 28 MPG driving it back home, all highway.

I always love talking to the owners of those little econoboxes getting 25 MPG, when I told them I got better gas mileage than they did... HAH!
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#1371344 - 01/17/08 12:25 AM Re: gears & mileage [Re: TechnoWeenie]
P71CVMAN Offline
Over the Hill

Registered: 07/09/07
Posts: 4840
Loc: wIScONSiN
Holy crap you guys are getting awesome gas mileage!!
_________________________
Need new ride!!! Old ride: '01 Vomit Comet w/128K miles!
Best 1/4 mile pass: 14.774 @ 94.09 w/2.256 60' time!

Exhaust/dragstrip videos

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#1371350 - 01/17/08 12:33 AM Re: gears & mileage [Re: P71CVMAN]
PantherP73 Offline

Relocated Yankee
Poobah

Registered: 06/19/05
Posts: 5341
Loc: Greenville, South Carolina
I used to get 15-18 mpg combined with my 3.08 gears. I recorded a personal best of 22.9 mpg on a road trip last summer, and I wasn't going 55. \:D

Now with this cold weather and my 3.55s, I'm lucky if I get 13.5 mpg combined. \:\(
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#1371367 - 01/17/08 12:44 AM Re: gears & mileage [Re: PantherP73]
JMSA540 Offline
Banned
Poobah

Registered: 05/30/07
Posts: 5776
I just drove a 220 mile trip tonight... getting back home I checked the scnagauge and I got 28.7 MPGS. All highway, going 65 mph.
_________________________
2000 Mercury Grand Marquis GS; 119,000 miles, 29 MPG highway/19.8 MPG city, 2.73 conventional rar, K&N Fuel Injection Performace Kit Cold Air Intake, K&N Performance Gold Oil Filter, Dual Flowmaster Super 44's, Goodyear GatorBack belt, 5W-20 Motorcraft semi-synthetic blend oil, Sylvania SilverStar Ultra's, 5% tint all the way around, ScanGauge II with X-Gauge. I'm selling my 1990 Ford F-150 XLT Lariat 4X4... PLEASE PM ME. https://www.crownvic.net/ubbthreads/ubbthreads.php?ubb=showflat&Number=1572213#Post1572213 Planning to buy a 2009 Ford Mustang GT. I LOVE MY FIANCE'! Matthew 21:22 wink

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#1371409 - 01/17/08 01:36 AM Re: gears & mileage [Re: JMSA540]
TechnoWeenie Offline
Banned
Posting Addict

Registered: 10/02/04
Posts: 22857
Loc: The perimeter
 Originally Posted By: JMSA540
I just drove a 220 mile trip tonight... getting back home I checked the scnagauge and I got 28.7 MPGS. All highway, going 65 mph.



I wouldn't trust the scanguage, look at your refills and calculate it that way.......

But still, that's what 2.73's will get ya ;\)
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#1371479 - 01/17/08 06:09 AM Re: gears & mileage [Re: TechnoWeenie]
6Paul11 Offline
Over the Hill

Registered: 12/15/06
Posts: 1833
Loc: Northern CA
So 3.73 not a great idea for highway? A 5 mpg hit would be too much, especially when I have a tune for 91 octane. If I stay steady at 65-70mph I can get a good range of 340-350 miles. What if I added a fifth overdrive gear with a custom tranny or is that not possible and I don't know what I'm thinking?
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2003 CVPI
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Enkei LS-5 18x8 wheels Black

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#1371491 - 01/17/08 06:52 AM Re: gears & mileage [Re: 6Paul11]
p71number10 Offline
Member

Registered: 04/10/07
Posts: 115
My car is a daily driver, with 3.55s. I drive it 90mi a day; 90% highway. I can get around 310mi per tank, but I drive 70-75mph. Lately, the mileage has seemed to drop some; probably the weather. I have considered going to 3.27s, but I don't know if the difference would be enough to justify the cost.
_________________________
99 P71, plain white: 180 stat, 5%/20% window tint, factory steelies and center caps, 2.5" H-piped exhaust with rear cats deleted and Pro-flo mufflers dumped at the axle, DIY HIDs in projector housings, power leather seats from a GM, JMod trans, Dorman PI intake

48 Ford F-1 truck, flathead v8 and a 3-spd, going under the knife soon...

03 Expedition FX4 - stock, wife's ride

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#1371517 - 01/17/08 08:05 AM Re: gears & mileage [Re: kustomizingkid]
Billz02MGM Offline
Climber

Registered: 02/10/06
Posts: 657
 Originally Posted By: kustomizingkid
 Originally Posted By: Carkid1989
2.73 gears? What kinda mileage with that? Best gearing for maximum highway mileage?

Thanks


2.73's are highway gears, cruising at speeds of 60-70mph you will be getting fairly optimal milleage. Some mebers have reported 26+ mpg highway.

My best has been 30 mpg between NE Ga and West Va,at an average speed of 65-70 mph. My average right now is about 26-27 mpg with winter blend fuel and average speed of 75.Thats with my current 2.73 RAR.
I also average 500 miles + a week.


Edited by Billz02MGM (01/17/08 08:06 AM)
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#1371531 - 01/17/08 08:26 AM Re: gears & mileage [Re: Billz02MGM]
Carkid1989 Offline
n00b

Registered: 01/07/08
Posts: 16
Is there a lower gear set you could put in for that extra little boost in mileage? 2.73 sound pretty good, but say you wanted to easily get 30(or better?)

2.6 something gears?
2.5 something gears?
I dont know if there is a set of gears that can be put in lower then 2.73 with out going with a whole new custom rear end but the thought intrugues me.

Hows the performance with the 2.73 gears? I assume its good because otherwise it wouldnt have been an option.

So with a lower ration performance might be a tad worse but MPG would go up...how would city MPG be effected by the different gears?

Thoughts?


Edited by Carkid1989 (01/17/08 08:28 AM)

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