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#1370519 - 01/16/08 08:32 AM gears & mileage
6Paul11 Offline
Over the Hill

Registered: 12/15/06
Posts: 1833
Loc: Northern CA
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.
2003 CVPI
BBK 70mm Tbody, ADTR ported plenum, Flowmaster dual exhaust, steeda UD pulley's, Heinous Rear Control Arms, Viper 160XVL SST Remote starter.
Enkei LS-5 18x8 wheels Black

I mostly come out at night...mostly.

#1370541 - 01/16/08 09:20 AM Re: gears & mileage [Re: 6Paul11]
03slickvic Offline

Registered: 01/29/07
Posts: 803
Loc: greenacres ,florida
i have 4.10's and do mostly city driving. if i am cruzing at 50 mph my rpms in over drive is 2000 rpms. at 70mph my rpms are around 2700-2800 rpms. i am getting around 17-19mpg city and 12-14mpg highway. you should be good with 3.73 gears for the kinda driving you do. remember you can always run a taller tire on big gears.
Aluminum mach 1 short block, forged -17cc dished pistons, AMS rods, 8 bolt crank, patroit stage 2 heads, comp cams 270, MMR oil pump & 9q pan,kooks long tubes,ported typhoon intake, 75mm throttle body, built trans, 2500 stall converter, sct programmer, 39lb injectors,85mm massair = N/A 283RWHP & 265 RWTQ

#1370547 - 01/16/08 09:34 AM Re: gears & mileage [Re: 03slickvic]
P71CVMAN Offline
Over the Hill

Registered: 07/09/07
Posts: 4840
Loc: wIScONSiN
If you get 3.73 gears won't you then need to get a new tune?
Anyone know what kind of time he would pick up in the quarter mile?
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

#1370607 - 01/16/08 11:20 AM Re: gears & mileage [Re: P71CVMAN]
gmbobp Offline

Registered: 06/17/05
Posts: 450
Loc: Kentucky
I went from 3.27's to 3.73's. My mileage went from 26/27 to 21/22 on the highway. Gas has at least 10% alcohol now and that is part of my loss.

Silver Frost 02 Grand Marquis GS; 3.73 Trac-Loc; MM Airbox & 80mm MAF; SCT XCallibrator 2 from BOC; Dual Exhaust w/ FRPP Megs; CVPI Rear Facia; Sylvania Silverstars 9007's; Pro Guard; Edelbrock IAS Shocks; Addco Sway bars; Cragar Soft 8's, 255/55-16 General Grabber UMP's.

#1370618 - 01/16/08 11:44 AM Re: gears & mileage [Re: gmbobp]

Registered: 09/12/06
Posts: 627
Loc: Indian Rocks Beach, Florida
I have a 3.55 traklok rear on my CVPI. I just took a road trip last Saturday. 250 miles round trip, with about 215 of that Interstate at mostly 70mph. I got 21.5 mpg. I use the cruise and keep it steady at the limit.
2000 Crown Victoria (CVPI), Wedgewood Blue Retired FHP Captains Cruiser - Purchased 09-11-06
MMC Driveshaft & 3.55 locker rear, Hybrid Marauder/Vic Intake w/PI Manifold, 75MM TB & spacer

Without GOD and family I have nothing.

#1370761 - 01/16/08 02:01 PM Re: gears & mileage [Re: 6Paul11]
LTDteether Offline
Over the Hill

Registered: 07/19/02
Posts: 4467
Loc: Democratic Rep. of Southpaw
2.73 or 3.73? I think with your kind of driving, you are nuts to go in the 3.73 direction.
'99 GM GS HPP.
I may not be a rocket scientist, but I *am* a scientist.

#1370766 - 01/16/08 02:11 PM Re: gears & mileage [Re: gmbobp]
P71CVMAN Offline
Over the Hill

Registered: 07/09/07
Posts: 4840
Loc: wIScONSiN
26/27 MPG with 3.27 gears? Sure you didn't have 2.73 or 3.08 gears?
I get 21 MPG at most with my 3.27 gears and I am usually cruising at 60 MPH and I use Shell gas(no alcohol). No cruise control in my car, but that can't account for 5 MPG difference.
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

#1370778 - 01/16/08 02:33 PM Re: gears & mileage [Re: P71CVMAN]
Dan The Vic Man Offline

Registered: 11/22/03
Posts: 9890
Loc: Coon Rapids MN
LOL i get 12mpg in my black vic, and quater mile times arent gonna drop a ton but they will drop, maybe .2 tenths of a second.
2012 Ford F150 Ecoboost

1998 mercury Grand Marquis, 58k miles slower than a turtle stock as stock gets


#1370782 - 01/16/08 02:39 PM Re: gears & mileage [Re: P71CVMAN]
Quickvic30 Offline
Just watchin
Grand Poobah

Registered: 02/24/05
Posts: 10922
Loc: Minneapolis, MN
I would not do it if you do that much highway driving, I have 3.73's and dread goin on highway trips. At 70 mph the car is at about 2400rpm, 80mph 2800-2900 rpm, doesn't sound that bad BUT it is over half of the engines RPM band.

#1370836 - 01/16/08 04:09 PM Re: gears & mileage [Re: Quickvic30]
20002CVLXSNTX Offline

Registered: 06/20/07
Posts: 401
I would not do it either...with the amount of driving you do it will cost you plenty. 3.27 have decent performance and mileage. I filled my car last night 428 miles on 18.1 gallons. Your not going to touch that with 3.73 gears.

#1371009 - 01/16/08 07:47 PM Re: gears & mileage [Re: 20002CVLXSNTX]
kustomizingkid Offline

Registered: 11/18/06
Posts: 5070
Loc: Minnesota
If I were you I'd be looking into 2.73....
2000 CVPI 121,000 miles

1998 Mark VIII Collector's Edition 110,000 miles

#1371064 - 01/16/08 08:37 PM Re: gears & mileage [Re: kustomizingkid]
Carkid1989 Offline

Registered: 01/07/08
Posts: 16
2.73 gears? What kinda mileage with that? Best gearing for maximum highway mileage?


#1371066 - 01/16/08 08:39 PM Re: gears & mileage [Re: kustomizingkid]
PI Offline
Ryan #1
Grand Poobah

Registered: 12/03/00
Posts: 12205
Loc: When it rains, it drizzles
I have thirsty 3.55s and the gas gauge drops like a rock in no time. 3.55s- Good in city, bad on highway. Unfortunately 98% of my driving is on the highway.
In memory of Matt "2vmodular". Gone but not forgotten. badge

- Ryan # 1

2009 CVPI
Ex Kirkland,WA Police
Dark Blue Metallic/Dark Charcoal interior
Bumper tuck mod
New OEM 17" Wheelcovers
Ford TripTunes Auxiliary port Input radio kit
Crown Victoria LX Auto-dim review mirror

#1371131 - 01/16/08 09:44 PM Re: gears & mileage [Re: PI]
psucrownvic Offline
Over the Hill

Registered: 08/09/07
Posts: 1142
Loc: Pittsburgh,PA
Hmmm, I believe mine has 2.73. Maybe thats why I am getting close to 20mpg city/highway combined?
1998 Police Interceptor
237K(117K on current engine/tranny)

#1371143 - 01/16/08 09:54 PM Re: gears & mileage [Re: psucrownvic]
null Offline

Registered: 07/21/07
Posts: 519
Loc: Ontario, Canada
how many miles do you all get on a full tank? could you also list your gears?

i seem to get about 450ish KM on a good day(279 miles) w/ a full tank then 50km (31miles)with the low fuel light w/ my 3.27 gears
04 Crown Vic p71

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