Better gas mileage

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Jul 4, 2014 | 09:06 AM

#76

BlueRidgeMark

CF Veteran

Joined: May 2012

Posts: 7,965

Likes: 964

From: Lost in the wilds of Virginia

Year: 1998 Classic (I'll get it running soon....) and 02 Grand

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by Jamie57

Remember the fuel we use nowadays has considerable less BTU's than it was years ago. If we could only get the higher octane numbers we were used to in the 60's and 70's we could bump up our compression.

The only difference in BTUs is the alcohol. Octane has nothing to do with BTUs. It's simply a measure of resistance to ignition. Higher octane means the fuel can take higher compression before self-igniting.

http://www.autoguide.com/auto-news/2...n-regular.html

http://www.autoguide.com/auto-news/2...is-octane.html

http://www.torquecars.com/articles/f...ne-ratings.php

http://www.dmperf.com/fuel_brands_an...ne_ratings.htm

Jul 8, 2014 | 08:33 PM

#77

crabmushrooms5

Senior Member

Joined: May 2012

Posts: 651

Likes: 0

From: Fayetteville, NC

Year: 1996

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by Jamie57

Well I'm a Freemason so automatically I'm in the Illuminati ( so I'm told by all the experts). And I'm a Shriner. No I don't drive a funny little car wear clown makeup or funny curled shoes. But I do play in the trumpet band!