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#1371533 - 01/17/08 08:32 AM Re: gears & mileage [Re: Carkid1989]
98VicP71 Offline
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Grand Poobah

Registered: 03/28/06
Posts: 12731
Loc: ATL
here are some ideas

2:73's will net you better highway mileage 27+ but worse city driving ~15MPG

3:27's are pretty much an good all round gear. I get 24-26MPG on the highway and am averaging 18MPG in straight city driving.

Now for each step up 3:55's, 3:73's you can expect a minimal increase for city driving and a 1-2MPG hit per gear for highway.

Does that make sence?
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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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#1371578 - 01/17/08 09:32 AM Re: gears & mileage [Re: 98VicP71]
xander Offline
Member

Registered: 04/17/07
Posts: 375
Loc: Ohio
Yea my 3:55's are good for me. 98% city with a real short trip on the highway to work. I get around 16-17mpg, thats with a lot of spirited driving too. Spring break is coming up and we may be going down to Florida. These are awsome road trip cars, depending on your gears. Im worried about how she'll do mileage wise.
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'99 CV Police Interceptor (Gatorback Belt/FIPK/Glasspacks/Steeda Underdrives/HIDs/C&L Ported Plenum and spacer/75mm TB/BOC tune) -189hp/225trq at the wheels-

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#1371589 - 01/17/08 09:43 AM Re: gears & mileage [Re: xander]
98VicP71 Offline
[email protected]
Grand Poobah

Registered: 03/28/06
Posts: 12731
Loc: ATL
with 3:55's you should be in the low to mid 20's for MPG on the highway.
_________________________
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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#1371594 - 01/17/08 09:47 AM Re: gears & mileage [Re: xander]
cowsareholy Offline
Rookie

Registered: 09/05/07
Posts: 88
Loc: Rhode Island
i get about 27-28MPG on my 200mile round trip to NH and back going around 70-75mph. my best was 34MPh drafting a trailer most of the way up at around 65MPH. 2:73's
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1996 C/V blue,sharkless plenum,cold ait kit,dual exhaust, rear cat delete, tune. thats all till the nice weather

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#1371667 - 01/17/08 11:31 AM Re: gears & mileage [Re: 6Paul11]
Ric Offline
Member

Registered: 05/06/06
Posts: 382
Loc: Brentwood Tennessee
 Originally Posted By: metalmania
How much mileage is lost going from 3.27 to 3.73? Does anyone have actual info on this subject? My driving is almost all highway getting to and from work and school. About 110 miles round trip give or take. Right now I get about 20-21mpg. Any specific info greatly appreciated. Feel free to add other info I should consider regarding 3.27-3.73 swap.


Around here gas is about $3 a gallon so lets use that. Right now you are getting around 20mpg on you 550 mile weekly commute. That would have you using 27.7 gallons costing $82.50. Now 20 mpg hywy is not great for a p71 with 3:27 so you might expect say 16mpg with 3:73. The same commute would take 34 gallons costing $103 adding over $80 to you monthly gas bill. If on the other hand you went to 2:73 you could expect 26mpg driving with a light foot and use 21 gallons for the week costing $63.5 and save your self about $80 a month from where you are now and a wopping $160 over what you would spend with 3:73s. If it costs $500 to change your gears it would take you six month and a week to break even going to 2:73. With the 3:73s you will have spent a extra $960 on gas + the $500 for the new gears.
If your going to be doing this type of driving for a couple of more years you could save some real money with 2:73s.

Ric
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Performance White with Tan Leather
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#1371720 - 01/17/08 12:27 PM Re: gears & mileage [Re: JMSA540]
rsierra Offline
n00b

Registered: 10/22/07
Posts: 31
Loc: Iowa
I'm glad someone else got on this topic and thanks for all the great info. I brought this up right after I bought my car..02' GM LSE package. I'm pretty sure that it's sporting the 3:55's but I didn't know that when I bought it. I just wanted a big car that got better gas mileage than I was getting with my suburban and I was hoping for around 25+ on the highway and 18 or so in town but after a couple of fills reality set in that I was averaging about 19 mpg with it (which is still better than 14). 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). I don't have a current estimate on MPG because it has some serious street tires on it and with the snow in iowa right now it gets around horrible so I'm driving my truck. For those of you that have 3:27 are you really getting close to 25mpg? To me that sounds like a good ratio to change to for better economy and not a drastic drop in performance like I would notice with 2:73's. I probably do about 50/50 Hwy/City driving now but it'll be more like 85/15 in the fall when my little guy goes to school and i don't have to pick him up in the middle of town from the sitter. Plus, my plan was having this car so we could take it on vacations and the GF can use it for tennis tournaments out of town so she's not drivin' her hog of a truck too. How about those of you rollin' with the 3:08 gears...what are you getting?

Thanks,
Randy
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#1371747 - 01/17/08 12:56 PM Re: gears & mileage [Re: rsierra]
Ric Offline
Member

Registered: 05/06/06
Posts: 382
Loc: Brentwood Tennessee
 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
_________________________
Beautiful 05 Crown Victoria LX
Performance White with Tan Leather
82,000 miles / 5-20 Mobil 1 / OEM Dual Exhaust
21mm OEM rear sway bar / Pro Guard rear bumper cover support


V8 RWD FORD....Baby!

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#1371770 - 01/17/08 01:21 PM Re: gears & mileage [Re: Ric]
98VicP71 Offline
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Grand Poobah

Registered: 03/28/06
Posts: 12731
Loc: ATL
agree you should have 3:27's. I used to do a 110mi round trip commute for a year before I moved.

anyway... I am going to be taking a good trip on Sat that will be 100% Hwy. I will see what I get as I will be running around 75-80MPH.

I know though that with a heavy foot even on the highway I have dipped to around 19-20MPG. but with a light foot I am almost getting that in City. Last time I drove a good distance on the highway 80% Hwy/ 20% city I averaged around 24.6MPG.
_________________________
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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#1371804 - 01/17/08 01:50 PM Re: gears & mileage [Re: 98VicP71]
rsierra Offline
n00b

Registered: 10/22/07
Posts: 31
Loc: Iowa
Ric,

Don't get me wrong. I have a heavy foot but I have tried Babying through a couple of tanks too and it didn't really help. I thought that the cars with the LSE package came with the 3:55's. My milage seems more in line with what everyone is describing of the 3:55's than the 3:27's. If estimates are right from what has been described, is my rolling down the road with 3:27's going to put me in the 22mpg if I'm going 75 or 80? That's 2 - 3 mpg less than suggested mileage should be. I should have had my buddy run the scan tool on it for sure when he was still at Ford.


Edited by rsierra (01/17/08 02:04 PM)
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#1371809 - 01/17/08 01:58 PM Re: gears & mileage [Re: rsierra]
98VicP71 Offline
[email protected]
Grand Poobah

Registered: 03/28/06
Posts: 12731
Loc: ATL
what is the axle code on your door sticker? I was only aware of 3:55's being put in TC or 99-00 CV/GM
_________________________
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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#1371937 - 01/17/08 04:38 PM Re: gears & mileage [Re: 98VicP71]
bboelkp71 Offline
Member

Registered: 07/22/07
Posts: 163
Loc: Milwaukee, WI
i've got 4:11's and get about 20-22 if i'm nice on the gas haha
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#1371954 - 01/17/08 04:55 PM Re: gears & mileage [Re: bboelkp71]
P71CVMAN Offline
Over the Hill

Registered: 07/09/07
Posts: 4840
Loc: wIScONSiN
^Are you talking city or highway driving?
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Best 1/4 mile pass: 14.774 @ 94.09 w/2.256 60' time!

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#1372166 - 01/17/08 08:13 PM Re: gears & mileage [Re: P71CVMAN]
rsierra Offline
n00b

Registered: 10/22/07
Posts: 31
Loc: Iowa
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.


Edited by rsierra (01/17/08 08:15 PM)
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#1372174 - 01/17/08 08:22 PM Re: gears & mileage [Re: bboelkp71]
Dan The Vic Man Offline
Poobah

Registered: 11/22/03
Posts: 9890
Loc: Coon Rapids MN
 Originally Posted By: bboelkp71
i've got 4:11's and get about 20-22 if i'm nice on the gas haha
I dont believe that, i know you arent talking highway miles are you, and are these gears in a vic?
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#1372321 - 01/17/08 11:05 PM Re: gears & mileage [Re: Dan The Vic Man]
P71CVMAN Offline
Over the Hill

Registered: 07/09/07
Posts: 4840
Loc: wIScONSiN
^Maybe he has the 4.11 gears sitting in his trunk waiting to be installed? \:\)
_________________________
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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