Michael Belliveau

First question, need to replace my clutch, does anyone have brand suggestions? 2008 wrangler with 33s, however plan on going to 37s soonish.

Second question, I took a trip to CO and on the way my alternator started to whine and luckily there was an AutoZone close by. I replaced it in the parking lot (upgraded to 160amp) and right after that my mpg went from 14.7 to 18? Could a bad alternator bearing really cause that much resistance that it would rob 3mpg?

rob_engineer

Alternator should have no effect on MPG. When you did the replacement, was your battery disconnected such that the MPG average was reset? Certainly in a highway trip, the MPG will be higher than typical. Maybe the lower value was averaging all driving, and the 3mpg higher was all highway because the computer was reset.

karls10jk

I average 16ish daily but resetting on the highway I can get into the 19 range, depending on how much coasting I'm doing. I can't see a 3mpg difference but if it really is then I'll need to go change mine pronto.

resharp001

This is the most logical explanation to me. I know I always feel better when I reset my fuel economy whilst a nice steady pace on the highway, or even better yet, while coasting down a mountain!

rob_engineer

I got 114 mpg when I towed the Jeep to Virginia last month.

Michael Belliveau

That is exactly what I thought, but I was keeping an eye on it and checked it via my my calculator/odometer the fill up right before I replaced the alternator and on the same road on the way back going the same speed?

Before alternator

After alternator

rob_engineer

Well do keep your eye on it. I'm skeptical. I tracked every single fill up on my 2012 over 8 years and 107,000 miles and posted about it on here. One thing that was interesting is that my son was in the Marines. I made several trips from NJ to Parris Island. I always got slightly better mpg on the way back to NJ compared to on the way to Parris island. I attributed that to the prevailing winds. Over that course of 107,000 miles of data, the only thing that had a definite effect on MPG was driving speed, towing, and temperature, which could be from winter and summer gas blends. Oil changes didn't matter. Differential and trans fluid changes didn't matter.

Michael Belliveau

Interesting. I will keep checking it to see if I maintain 17 to 19 mpg.

baileyj

I love jeep people, everybody jumped on the possibility of saving 3 mpg, but nobody answered his clutch question.

Mark Doiron

LOL. I was scrolling down through reading the replies first.

Centerforce DualForce II. Has a nice, light pedal, if you like that sort of thing.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1