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Unread 01-10-2014, 02:12 AM   #1
Brycereuille
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2002 TJ Wrangler 
 
Join Date: Jan 2014
Location: Fort Wayne, Indiana
Posts: 25
What should my rpms be and why poor mpg

Hey I have a 02 tj 4.0. All stock drive train on 33's .. I think my rpms are really high but to sure cause I'm new to jeeps. So roughly what should my rpms be like at 70 mph?? It's almost 3000. Is that right? Also what kind of fuel millage should I be getting. I know it a jeep and not a Prius, buy I don't think 10 mpg is right since it only has 85k miles. What do you think??

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Unread 01-10-2014, 10:36 AM   #2
Evildriver-3
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1995 ZJ 
 
Join Date: Mar 2005
Location: , Suffolk, NY
Posts: 879
depends what gear you have for the final, but it sounds like 4.1 if you're not in od, if in od then its more
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Unread 01-10-2014, 10:48 AM   #3
Brycereuille
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2002 TJ Wrangler 
 
Join Date: Jan 2014
Location: Fort Wayne, Indiana
Posts: 25
Yes in just drive I'm running 3k at 65mph
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Unread 01-10-2014, 07:30 PM   #4
MarkNog
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2004 TJ Wrangler 
 
Join Date: Sep 2011
Location: Millstone, NJ
Posts: 57
Check out this nifty RPM calculator. It says: 4.10 gears + 1:1 trans ratio = 3000 @ 70

http://www.ringpinion.com/calculators/calc_rpm.aspx
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