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Topic Review (Newest First)
09-08-2013 02:09 PM
PStov98TJ
Quote:
Originally Posted by Don02wrangler View Post
To Jerry Bransford - I posted a question ealier today.. Is there a speedo drive gear? How would I recalibrate speedo?
THanks!
Yes there is. This is how you change it http://www.wranglerforum.com/f105/sp...ge-121033.html
09-08-2013 01:56 PM
Don02wrangler To Jerry Bransford - I posted a question ealier today.. Is there a speedo drive gear? How would I recalibrate speedo?
THanks!
08-24-2013 11:17 AM
Atthehop
Quote:
Originally Posted by flflash View Post
I just don't know why it's so difficult to measure fuel mileage?

Step 1: Use a GPS to verify your speedometer/odometer readings.

Step 2: Fill up with gas. Note odometer reading.

Step 3: Drive vehicle normally until it needs gas again.

Step 4: Refill with gas, noting how many gallons it takes to fill up.

Step 5: Divide gallons of gas used into miles driven.

Step 6: Wonder if driving your Jeep is worth the cost of fuel to operate it.

Step 7: Go on Jeep forums and either Brag about your mileage ( anything over 16 is bragging ) or bemoan how poor your mileage is ( under 15 )

I guess I can brag since I get over 16. LOL
08-24-2013 11:00 AM
Jerry Bransford
Quote:
Originally Posted by jrcnova View Post
The odometer reading will be off because of the 35's. If I was totally stock, your method would be correct.
It takes less than five minutes to replace the speedometer gear to get your speedometer accurate again.
08-24-2013 10:55 AM
flflash
Quote:
Originally Posted by jrcnova View Post
My Speedo has not been recalibrated,hence my question.
Step 1b: Calibrate speedometer or use GPS to track miles driven.
08-24-2013 10:53 AM
jrcnova
Quote:
Originally Posted by Jerry Bransford View Post
That's a lot of math to arrive at the same answer given by simply dividing the number of miles driven since the last fill-up by the number of gallons required to refill the tank which provides the mpg.
The odometer reading will be off because of the 35's. If I was totally stock, your method would be correct.
08-24-2013 10:51 AM
jrcnova My Speedo has not been recalibrated,hence my question.
08-24-2013 10:10 AM
flflash I just don't know why it's so difficult to measure fuel mileage?

Step 1: Use a GPS to verify your speedometer/odometer readings.

Step 2: Fill up with gas. Note odometer reading.

Step 3: Drive vehicle normally until it needs gas again.

Step 4: Refill with gas, noting how many gallons it takes to fill up.

Step 5: Divide gallons of gas used into miles driven.

Step 6: Wonder if driving your Jeep is worth the cost of fuel to operate it.

Step 7: Go on Jeep forums and either Brag about your mileage ( anything over 16 is bragging ) or bemoan how poor your mileage is ( under 15 )
08-24-2013 10:06 AM
Jerry Bransford If the speedometer is reasonably accurate or has been recalibrated after changing the tire diameter, the mileage shown on the odometer is accurate enough for 99.999% of us wanting to know our mpg.
08-24-2013 09:59 AM
Test4Echo
Quote:
Originally Posted by Jerry Bransford View Post
That's a lot of math to arrive at the same answer given by simply dividing the number of miles driven since the last fill-up by the number of gallons required to refill the tank which provides the mpg.
Unless he has a pro cal or similar you can't use that equation because the mileage will not be accurate.
08-24-2013 09:54 AM
Jerry Bransford That's a lot of math to arrive at the same answer given by simply dividing the number of miles driven since the last fill-up by the number of gallons required to refill the tank which provides the mpg.
08-24-2013 09:42 AM
jrcnova New to the forum and to Jeeps. Just bought a 2000 TJ 4.0, 5 speed with a 4" lift and 35x12.50/15. I scoured the forums to figure out how I can determine my gas mileage. Correct me if I'm wrong but the following equation is what I've found.

Current tire diameter / original tire diameter = answer

Answer X odometer mileage = actual mileage driven

Actual miles driven / number of gallons purchased = mpg

So with that said here's what I've come up with:

35/27.7=1.263537906

1.263537906 X 165.5 = 209.11

209.11/11.392 = 18.36 mpg

Correct?

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