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#1372508 - 01/18/08 07:38 AM Re: gears & mileage [Re: rsierra]
98VicP71 Offline
[email protected]
Grand Poobah

Registered: 03/28/06
Posts: 12731
Loc: ATL
 Originally Posted By: rsierra
Wow, I thought i had read somwhere 3:55 but your right...3:27...z5 code. I totally nursed a tank early on with 50/50 city/Hwy and my average was only in the 18.5 range. I went to my parents which is all country roads and I really wasn't over 65 much and I don't think it was any better than about 22 but spring and nice weather will be a better test I guess. I'll just have to watch it on a trip and go easy to get a real feel. If I could hit 24 or 25 on the hwy I'd be tickled. Thanks for the feedback.


There are a couple factors here. You are seeing a decrease in MPG right now because of winter blend gas. If you are still experienceing bad fuel economy here are a couple things I would recommend

Replace fuel filter
clean MAF
check/change air filter
clean TB
reset computer
Check spark plugs
_________________________
1993 Lincoln Town Car 150k+ - RIP 5/10/2011
1998 Ford Crown Victoria P71 - RIP 12/25/2006
2001 Ford Crown Victoria P71(Count blackula) 297k+ - Ummmmmm evil

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#1372656 - 01/18/08 11:59 AM Re: gears & mileage [Re: Ric]
20002CVLXSNTX Offline
Member

Registered: 06/20/07
Posts: 401
 Originally Posted By: Ric
 Originally Posted By: rsierra
I am probably in the 21.5 range on the Highway but I have a heavy foot too. I'm pretty sure that it has the 3:55 gears in it (governor kicks in around 112).

Thanks,
Randy


You more than likely have 3:27s and the only was to get get good mileage in to ease off the gas. light= good mileage heavy foot= poor mileage. No way around it. Proper tire pressure is a big factor in mileage as well.

Ric


X1 I can get decent mileage with my 3.27 with a light foot but if I get ignorant with the pedal it DROPS way down to 16-18MPG.
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#1372658 - 01/18/08 12:01 PM Re: gears & mileage [Re: bboelkp71]
20002CVLXSNTX Offline
Member

Registered: 06/20/07
Posts: 401
 Originally Posted By: bboelkp71
i've got 4:11's and get about 20-22 if i'm nice on the gas haha


Yeah....right
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#1372741 - 01/18/08 01:42 PM Re: gears & mileage [Re: 98VicP71]
suumoe Offline
Stranger

Registered: 12/18/07
Posts: 8
What is involved in resetting the computer?

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#1372785 - 01/18/08 02:29 PM Re: gears & mileage [Re: suumoe]
98VicP71 Offline
[email protected]
Grand Poobah

Registered: 03/28/06
Posts: 12731
Loc: ATL
disconnect the positive battery cable for around 10min then reconnect.
_________________________
1993 Lincoln Town Car 150k+ - RIP 5/10/2011
1998 Ford Crown Victoria P71 - RIP 12/25/2006
2001 Ford Crown Victoria P71(Count blackula) 297k+ - Ummmmmm evil

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#1372881 - 01/18/08 03:57 PM Re: gears & mileage [Re: 98VicP71]
Bobert2647 Offline
Former Vic Owner
Posting Addict

Registered: 09/16/04
Posts: 21245
Loc: West TN
I've gotten up to 21mpg mixed with open 2.73's I can't wait to get 3.55's installed.

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#1372911 - 01/18/08 04:37 PM Re: gears & mileage [Re: bboelkp71]
MattMans88 Offline
Member

Registered: 01/08/08
Posts: 164
 Originally Posted By: bboelkp71
i've got 4:11's and get about 20-22 if i'm nice on the gas haha


In my Mustang I get 25mpg on the highway with 3.73's and a 5 speed. My average with mixed driving is 21mpg. I'm not seeing this with a Vic bud.
_________________________
2003 P71, spotlight, perpetrator cage. Stock for the time being.


1988 Mustang LX, 5.0, 5 speed, O/R X-pipe and Magnaflow cat-back (sounds soooo good), K&N filter, U/D pullies, and a system for good measure. 21 mpg in mixed driving

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#1372963 - 01/18/08 05:36 PM Re: gears & mileage [Re: MattMans88]
p71number10 Offline
Member

Registered: 04/10/07
Posts: 115
 Quote:
In my Mustang I get 25mpg on the highway with 3.73's and a 5 speed.


Ditto (well, 22-23); my stang isn't even tuned yet either, but the mileage is so good I'm afraid to change anything.
_________________________
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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#1372971 - 01/18/08 05:46 PM Re: gears & mileage [Re: bboelkp71]
Ciffer Offline
Over the Hill

Registered: 05/16/06
Posts: 4366
Loc: Witchataw KS
 Originally Posted By: bboelkp71
i've got 4:11's and get about 20-22 if i'm nice on the gas haha


4.11:1 is a 9-inch ratio. you may mean 4.10:1, i would believe you if you have an early aero, although i don't know your model/year

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#1373032 - 01/18/08 06:54 PM Re: gears & mileage [Re: Bobert2647]
PI Offline
Ryan #1
Grand Poobah

Registered: 12/03/00
Posts: 12205
Loc: When it rains, it drizzles
 Originally Posted By: Bobert2647
I've gotten up to 21mpg mixed with open 2.73's I can't wait to get 3.55's installed.


Wanna trade? lol
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- Ryan # 1


2009 CVPI
Ex Kirkland,WA Police
Dark Blue Metallic/Dark Charcoal interior
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#1373163 - 01/18/08 09:10 PM Re: gears & mileage [Re: 98VicP71]
TechnoWeenie Offline
Banned
Posting Addict

Registered: 10/02/04
Posts: 22857
Loc: The perimeter
Well, last night I swapped in the 2.73's and changed the speedo gear.

I know this is unscientific BUT....

On the way up, with 3.27's, 65 MPH all the way, I put EXACTLY 5 gallons in, just as my low fuel light came on, before I got on the highway, and made it to 98 miles before the low fuel light came on again, I drove around for another 5 miles after that to reach my destination.

On the way BACK, I filled up EXACTLY 4 gallons, I was stuck behind a rolling roadblock @ 20MPH for about 5 miles, then hit 65MPH the rest of the way down, and my low fuel light came on @94 miles...

3.27, 5 gallons @ 98 miles= 19.6 MPG

2.73, 4 gallons @ 94 miles= 23.5 MPG

completely unscientific, and LOTS of room for error, but you can definitely see the difference...

There is a HUGE difference between 2.73's and 3.27's, I IMMEDIATELY noticed that off the line performance was damn near pitiful, but @ highway speeds, the engine wasn't working nearly as hard maintaining speed, and on steep grades it wasnt 'engine braking' like it normally would.. With 3.27's on steep grades I could put it in N and GAIN speed, while if in D it would keep speed/slow down. With the 2.73's, there's much less resistance because of such low gearing, and was about the same as if in N on the same steep grade,gaining speed.

WARNING TO THOSE WITH 2.73's! It's MUCH easier to speed with lower gears. I normally can maintain 60-65 without even looking at my speedo. Because of the completely different feel of the lower gearing, I found myself inching up to 70-75 without even noticing. Backing off the gas with 3.27's netted an almost instant decel, backing off the gas with 2.73's netted me almost nothing.. heh..

Again, completely unscientific, but numbers nonetheless..

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#1373531 - 01/19/08 10:37 AM Re: gears & mileage [Re: p71number10]
MattMans88 Offline
Member

Registered: 01/08/08
Posts: 164
 Originally Posted By: p71number10
 Quote:
In my Mustang I get 25mpg on the highway with 3.73's and a 5 speed.


Ditto (well, 22-23); my stang isn't even tuned yet either, but the mileage is so good I'm afraid to change anything.


Haha yeah, mine runs weird sometimes but still gets great mileage. Do you get 22-23 in mixed driving or strictly highway? Thats great either way, especially with an SN95.


I have a question, where is this tag I read to find out the rear end gears in my 2003 P71. I'm curious now lol.
_________________________
2003 P71, spotlight, perpetrator cage. Stock for the time being.


1988 Mustang LX, 5.0, 5 speed, O/R X-pipe and Magnaflow cat-back (sounds soooo good), K&N filter, U/D pullies, and a system for good measure. 21 mpg in mixed driving

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#1373577 - 01/19/08 11:55 AM Re: gears & mileage [Re: MattMans88]
p71number10 Offline
Member

Registered: 04/10/07
Posts: 115
That's strictly highway. In town, I don't even want to know what my mileage is,.... I have a hard time staying out of the loud pedal...

There is a sticker in the driver's door jamb, showing the axle code, or, there should be a metal tab on one of the diff cover bolts.
_________________________
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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#1373585 - 01/19/08 12:03 PM Re: gears & mileage [Re: TechnoWeenie]
mrbear5300 Offline
professional grade
Poobah

Registered: 12/29/05
Posts: 5059
Loc: BUF
 Originally Posted By: TechnoWeenie
Well, last night I swapped in the 2.73's and changed the speedo gear.

I know this is unscientific BUT....

On the way up, with 3.27's, 65 MPH all the way, I put EXACTLY 5 gallons in, just as my low fuel light came on, before I got on the highway, and made it to 98 miles before the low fuel light came on again, I drove around for another 5 miles after that to reach my destination.

On the way BACK, I filled up EXACTLY 4 gallons, I was stuck behind a rolling roadblock @ 20MPH for about 5 miles, then hit 65MPH the rest of the way down, and my low fuel light came on @94 miles...

3.27, 5 gallons @ 98 miles= 19.6 MPG

2.73, 4 gallons @ 94 miles= 23.5 MPG

completely unscientific, and LOTS of room for error, but you can definitely see the difference...

There is a HUGE difference between 2.73's and 3.27's, I IMMEDIATELY noticed that off the line performance was damn near pitiful, but @ highway speeds, the engine wasn't working nearly as hard maintaining speed, and on steep grades it wasnt 'engine braking' like it normally would.. With 3.27's on steep grades I could put it in N and GAIN speed, while if in D it would keep speed/slow down. With the 2.73's, there's much less resistance because of such low gearing, and was about the same as if in N on the same steep grade,gaining speed.

WARNING TO THOSE WITH 2.73's! It's MUCH easier to speed with lower gears. I normally can maintain 60-65 without even looking at my speedo. Because of the completely different feel of the lower gearing, I found myself inching up to 70-75 without even noticing. Backing off the gas with 3.27's netted an almost instant decel, backing off the gas with 2.73's netted me almost nothing.. heh..

Again, completely unscientific, but numbers nonetheless..



I have 2.73's and its very responsive in the 60mph and up range. However, this gearing makes it feel poderous and "boaty" at lower speeds driving around town. And I'm still getting a miserable 16.5 mpg 70/30 city/highway mix. Winter fuel and cold weather is partly to blame, though.
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#1373589 - 01/19/08 12:06 PM Re: gears & mileage [Re: p71number10]
MattMans88 Offline
Member

Registered: 01/08/08
Posts: 164
 Originally Posted By: p71number10
That's strictly highway. In town, I don't There is a sticker in the driver's door jamb, showing the axle code, or, there should be a metal tab on one of the diff cover bolts.


If I'm not mistaken because of the sticker being faded, it reads the axle code as X5. Sound right?
_________________________
2003 P71, spotlight, perpetrator cage. Stock for the time being.


1988 Mustang LX, 5.0, 5 speed, O/R X-pipe and Magnaflow cat-back (sounds soooo good), K&N filter, U/D pullies, and a system for good measure. 21 mpg in mixed driving

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