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Old 04-22-2013, 05:00 PM   #1
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what is my MPG with this set up

so I have 30in mud tires 2 inch lift...2.5 5speed... according to my Speedo im getting 12MPg.. now with figuring in tire size would my MPG be actually higher or lower

thanks

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Old 04-22-2013, 06:30 PM   #2
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well I know my jeep stock came with a 30in tire so what year are you running. and do a speed test with a GPS using its speedo and your cars speedo see if ur calculations in your jeep is off. I trust my GPS more than my cars readings
for me moving from my stock 30in to 33s at 50mph my speedo was off by 5mph so my cars speedo read 50 but i was actually going 55mph. but even at stock it was off by 2mph

to adjust it is go to quadratec and go to speedo gears. there is a calculator that shows the size of tire by gear ratio to correct your readings that might be all u need to do as well.

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Old 04-22-2013, 06:41 PM   #3
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Yeah. Something isn't right there. Did the jeep ever have larger tires? Is it still on stock gears? Have you replaced O2 sensors lately?
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Old 04-22-2013, 07:31 PM   #4
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Originally Posted by pastorscott View Post
so I have 30in mud tires 2 inch lift...2.5 5speed... according to my Speedo im getting 12MPg.. now with figuring in tire size would my MPG be actually higher or lower

thanks
First 30" tires did not come stock from factory I don't think with the 2.5L. check the White sticker on the Drivers door it should tell you what the stock tire is probably anywhere from 215/75 would come on a 4cyl stock I think could be wrong.

Next you have to determine as one of the posters said is to check the speed against GPS if larger tires where put on to replace the smaller stock tires then speedo will read slower than you really going 55 speedo 60 GPS.

Next is to find gear ratio more than likely your still running 4.10 gears as there would be no reason to change out the gears for such a small tire difference. Look on the rear axle differential there is a tag that should say 4.10 on them.

Once you determine your tire and gear you can go get the correct speedo gear.

Jeep Parts, Jeep Accessories & Jeep Soft Tops From The Jeep Parts Experts - Quadratec

Should read 38 tooth gear if your still running 4.10 gears.

I know for a fact you can get better MPG with the 2.5L I had 33" with 4.10 and got 17MPG.
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Old 04-22-2013, 07:31 PM   #5
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It's not a car it's a jeep, and it's the odometer not speedometer. Just for future reference. But I went from 235/75/r15 to 31-1050-15 I get the same gas mileage except my Speedo is off now so I'm actually getting better mpg.I was getting 17-18 now I'm getting 16.5-17.5 so dame near the same. I lost quite a bit of power so maybe I drive easier now. Not too sure. Its some other factor causing bad mpg i believe.
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Old 04-22-2013, 07:44 PM   #6
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It's not a car it's a jeep, and it's the odometer not speedometer. Just for future reference.
Does not matter if its a car or a jeep a Speedometer and an odometer are found in both Vehicles one shows how fast your going the other counts how many miles you have driven. But yes it is odometer you are referencing Pastor
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Old 04-22-2013, 08:27 PM   #7
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Just stating facts. No worries man. I wasn't a jerk about it.
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Old 04-22-2013, 08:36 PM   #8
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Just stating facts. No worries man. I wasn't a jerk about it.
cool

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