What should my rpms be and why poor mpg - JeepForum.com
 
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post #1 of 4 Old 01-10-2014, 02:12 AM Thread Starter
Brycereuille
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2002 TJ Wrangler 
 
Join Date: Jan 2014
Location: Fort Wayne
Posts: 27
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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post #2 of 4 Old 01-10-2014, 10:36 AM
Evildriver-3
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1995 ZJ 
 
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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

1995 Jeep gc ltd, 2005 Jeep gc ltd , 71 Dart, 73 RR 440-6pk, 78 Mag GT, 85 Power Ram W-350, 92 Daytona, 99 Dakota, 08 Ram 2500

Less than 8 is like playing with half a deck
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post #3 of 4 Old 01-10-2014, 10:48 AM Thread Starter
Brycereuille
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2002 TJ Wrangler 
 
Join Date: Jan 2014
Location: Fort Wayne
Posts: 27
Yes in just drive I'm running 3k at 65mph
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post #4 of 4 Old 01-10-2014, 07:30 PM
MarkNog
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2004 TJ Wrangler 
 
Join Date: Sep 2011
Location: Millstone
Posts: 63
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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