JeepJeepster
Full Access Member
Its possible that you have the 45rfe..
RPM at 65
- Thread starter tazzsrenegade
- Start date
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Its possible that you have the 45rfe..
Bikeflyer
Full Access Member
I just did a trip from Lancaster Pa to Indianapolis and back with my 05 with the 3.7L.
19mpg city
19mpg 75mph+(2500rpm)
24mpg 60-70mph(2200 rpm)
25.5 mpg 60-70mph drafting semis. (2100rpm)
This is all stock with fresh Mobil 1 syn and K&N filters, new Bosh plats.
19mpg city
19mpg 75mph+(2500rpm)
24mpg 60-70mph(2200 rpm)
25.5 mpg 60-70mph drafting semis. (2100rpm)
This is all stock with fresh Mobil 1 syn and K&N filters, new Bosh plats.
tazzsrenegade
Full Access Member
Jeepjeepster yes i have the 45rfe, does it make a difference?
tjkj2002
Full Access Member
- Joined
- Dec 17, 2006
- Messages
- 10,612
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- 42
Yes,different gear ratios in the trans compared to the 42RLE.
Powerslave
Banned
42RLE: 2.840, 1.570, 1.000, 0.690
45RFE: 3.000, 1.67/1.50, 1.000, 0.750
Two second gear ratios, second (up-shift) and second prime (kick-down).
The specs say Rear Wheel Drive Xmissions, but they should be the same. If not, still, you can see the different gear ratios.
45RFE: 3.000, 1.67/1.50, 1.000, 0.750
Two second gear ratios, second (up-shift) and second prime (kick-down).
The specs say Rear Wheel Drive Xmissions, but they should be the same. If not, still, you can see the different gear ratios.
Yeah, there's the difference right there. The different ****** gearing accounts for 200 rpm difference at 65mph.......all elce being equal.
05Sport
Full Access Member
1950 @ 65. 3.7L Auto Trans. 42RLE
RenegadeJay
Full Access Member
Not like anyone cares, but I feel compelled to correct myself after looking at my mileage log this morning. I don't get 240 for a half a tank....it's 170 per half tank. Just wanted to correct myself before someone called me out on it. My mistake.
It puzzles me why one 3.7L engine will get 16 and another 22 MPG.
Is there that big of a difference on the gearing you can order on
a Liberty?
My 04 is a manual ****** and no factory tow package. I got a combo
of 15 MPG pulling a heavy pop-up camper to the U.P. of MI, staying a
week and then pulling the camper back home.. Guess that's not bad
after reading some of the other posts.
Is there that big of a difference on the gearing you can order on
a Liberty?
My 04 is a manual ****** and no factory tow package. I got a combo
of 15 MPG pulling a heavy pop-up camper to the U.P. of MI, staying a
week and then pulling the camper back home.. Guess that's not bad
after reading some of the other posts.
Bikeflyer
Full Access Member
It makes a HUGE difference in how you throttle also. The place it bites you is if you need to change speed or spike it past 2000 rpm. Keep it nice and throttle slowly and you will see a significant improvement in mileage. I also had an improvement when I went to Mobil 1 Syn oil which was only 22 bucks.
