seanof30306@yahoo.
NAXJA Forum User
- Location
- Tulsa, Ok
Here's my XJ
96 Cherokee Classic 4.0
95 head: intake and exhaust ports matched to gasket; otherwise stock
Up Country 3.55 posi
255/70R15 Bridgestones
81,000 miles
15 mpg in town, 17 highway
I've recently gotten the MPG up to 20 by using some hypermiler driving techniques. I use my XJ exclusively on the road. I want to keep it because a) it's paid for, b) it's really good in the snow and rain, and c) I like it.
I'd like to look into making some improvements to increase mileage, but, I don't want to be stupid in doing so. An increase of 3 mpg, for example, saves me about 220.00 per year with 3.00 per gallon gas. If I spend 400.00 to get that increase, it'll take me two years to save any money.
One area I've been looking at is the gearing. My rearend has been howling since the day I bought it new, and it started making a moaning sound on very slow speed corners about three years ago. It used to do it only after long highway runs, but, now, it's doing it all the time. I figure it's the clutches in the posi.
When I go into the rearend, IF the gears have to be replaced, I'm considering going to a 3.08. I figure it'll cost another 2-300.00 to do the front as well. If I don't have to replace the gears in the rearend, I don't think swapping ratios would make sense. Unless going from 3.55s to 3.08s would make a HUGE difference in mileage, it just wouldn't make sense to spend 600 bucks to do it.
I'm wondering what kind of difference I could expect in mileage from that gear swap, and am also looking for suggestions on other mods that would improve mpg.
96 Cherokee Classic 4.0
95 head: intake and exhaust ports matched to gasket; otherwise stock
Up Country 3.55 posi
255/70R15 Bridgestones
81,000 miles
15 mpg in town, 17 highway
I've recently gotten the MPG up to 20 by using some hypermiler driving techniques. I use my XJ exclusively on the road. I want to keep it because a) it's paid for, b) it's really good in the snow and rain, and c) I like it.
I'd like to look into making some improvements to increase mileage, but, I don't want to be stupid in doing so. An increase of 3 mpg, for example, saves me about 220.00 per year with 3.00 per gallon gas. If I spend 400.00 to get that increase, it'll take me two years to save any money.
One area I've been looking at is the gearing. My rearend has been howling since the day I bought it new, and it started making a moaning sound on very slow speed corners about three years ago. It used to do it only after long highway runs, but, now, it's doing it all the time. I figure it's the clutches in the posi.
When I go into the rearend, IF the gears have to be replaced, I'm considering going to a 3.08. I figure it'll cost another 2-300.00 to do the front as well. If I don't have to replace the gears in the rearend, I don't think swapping ratios would make sense. Unless going from 3.55s to 3.08s would make a HUGE difference in mileage, it just wouldn't make sense to spend 600 bucks to do it.
I'm wondering what kind of difference I could expect in mileage from that gear swap, and am also looking for suggestions on other mods that would improve mpg.