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  • 1965 - 1973 Classic Mustangs -General/Talk-
  • Classic Mustang Specific Tech

gas mileage vs. gears

  • Thread starter Thread starter jcp123
  • Start date Start date Jan 16, 2004

jcp123

New Member
Nov 1, 2003
408
0
0
Tyler, TX
Jan 16, 2004
#1
  • Jan 16, 2004
  • #1
i've been thinking about swapping out my 2.73's for some 3.25's, but i'm worried that my gas mileage will drop a lil more than i want it to going tnto college, etc. it's a 302/c4, and right now cruises at 65 at 2100rpm; with 3.25's it should be ~2600, correct?
my mileage right now is pretty good, it's about 16 average (~12 city, ~22 freeway). with 3.25's, i know my freeway mileage is gonna suck, but i also know that the city mileage should get better. still, i don't think they would even out, would they? what's your guys' best guess about where my mileage should be?
 

TurboDoctor

Founding Member
Jan 27, 2002
1,008
2
38
San Marcos, Texas(Austin)
Jan 16, 2004
#2
  • Jan 16, 2004
  • #2
Was gas at right now out there anyway, Last time I was in the bay area it was still running 1.82 in the concord/lafayete area and 2.00 or so in the san jose area.
 

jcp123

New Member
Nov 1, 2003
408
0
0
Tyler, TX
Jan 16, 2004
#3
  • Jan 16, 2004
  • #3
well i got 87 octane here in milpitas at $1.60 today...
 

2bav8

Founding Member
Nov 30, 1998
2,511
1
47
Mesa, AZ
Jan 16, 2004
#4
  • Jan 16, 2004
  • #4
There have been two major items that have reduced my fuel milage in the last few years IMO. Having gone from 22 MPG on the freeway and 12 +/- in town, I see 16 on the freeway but still manage 12 in town. The first and what I assume killed my freeway milage is going from 3.50 gears to 4.11s. Second, I'm pretty sure that a dual plane intake is going to get better milage than a single plane. Lastely, the addition of 58 cubes isn't going to help milage either.
 

jcp123

New Member
Nov 1, 2003
408
0
0
Tyler, TX
Jan 16, 2004
#5
  • Jan 16, 2004
  • #5
so minus the extra cubes...and since i already have a dual plane...i shouldn't see a huge drop in my average mileage?
 

2bav8

Founding Member
Nov 30, 1998
2,511
1
47
Mesa, AZ
Jan 16, 2004
#6
  • Jan 16, 2004
  • #6
Don't forget I have overdrive.
 

jcp123

New Member
Nov 1, 2003
408
0
0
Tyler, TX
Jan 16, 2004
#7
  • Jan 16, 2004
  • #7
yeah but did you have overdrive both before and after? i thought you did...
 
1

1969mach1351

Member
Apr 18, 2003
285
0
16
Sacramento, CA
Jan 17, 2004
#8
  • Jan 17, 2004
  • #8
I went from 3.25 to 3.50 gears and my gas milage went up in town. If you are driving alot on the freeway your milage will go down. If you are doing more in town your milage should go up since it will be easier for you engine to get your car moving.
 

jcp123

New Member
Nov 1, 2003
408
0
0
Tyler, TX
Jan 17, 2004
#9
  • Jan 17, 2004
  • #9
i know that much...i just need to know by about how much...right now i do 60/40 town/freeway, but i don't know how that's gonna be when i'm off to college. all's i need are some approximate numbers...
 

jcp123

New Member
Nov 1, 2003
408
0
0
Tyler, TX
Jan 18, 2004
#10
  • Jan 18, 2004
  • #10
anybody?? please?? i'll be your best friend!!
 

2bav8

Founding Member
Nov 30, 1998
2,511
1
47
Mesa, AZ
Jan 19, 2004
#11
  • Jan 19, 2004
  • #11
I've always had overdrive.
 
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