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Old 01-16-2011, 07:13 PM   #1
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Gas mileage help!

ok right now i have a '94 yj 2.5l 5spd with no lift or any body mods. right now im getting about 18-19 mpg. but i really wanna switch to the I6 engine. what could i expect to get if i made the switch?

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Old 01-16-2011, 07:15 PM   #2
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just about the same. from 15-18 mpg.

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Old 01-16-2011, 08:24 PM   #3
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closer to 15

but... Im getting a bit better mileage now with my 33's. Lower RPM at high speeds.
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Old 01-16-2011, 08:25 PM   #4
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I'm getting 15 mpg with 33's and stock gearing. My dad (stock) gets about 18
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Old 01-16-2011, 08:28 PM   #5
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It all depends on what tires you run, gearing and driving habbits.
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Old 01-16-2011, 08:34 PM   #6
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I4 to I6 isn't really a worth switch, unless you already have some of the parts. If you don't, it's going to cost almost the same as throwing a Chevy 350 in there.
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Old 01-16-2011, 09:42 PM   #7
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well considering i really know nothing about switching engines. what all would it consist of?
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Old 01-17-2011, 09:26 PM   #8
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Fuel mileage on the 4.0 is actually better than the 2.5 if you put a little money into the motor. We were at almost 20mpg on a regular basis with 30" tires, K&N FIPK, 62mm TB, 62mm spacer, Banks Header/headpipe, and gibson cat-back.
I know plenty of people with stock 2.5's that get worse mileage than those with the 4.0's.

We average 17-19 with all the mods above listed with 32" tires, 2" lift and 1" body lift.
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Old 01-17-2011, 09:51 PM   #9
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the 2.5 is just as good as a i6 not worth the money
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Old 01-17-2011, 10:28 PM   #10
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It is usually cheaper to sell your jeep and buy one that has the engine you want rather than buy all the parts and swap them.
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Old 01-17-2011, 10:37 PM   #11
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very verry true
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Old 01-17-2011, 11:41 PM   #12
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Quote:
Originally Posted by yjforlife View Post
the 2.5 is just as good as a i6 not worth the money

While it is not smart cost-wise to swap a 2.5 for a 4.0 (you may as well go 350 TBI motor).

But as far as the 2.5 being as good as a 4.0 ; I want some of what you're smokin. The 2.5 isn't even in the same class. Even stock, the 2.5 is gutless and could use re-gearing for 30" tires.
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Old 01-18-2011, 12:47 AM   #13
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I agree with VooDuuChild I actually own a 2.5 and whoever came up with that motor must have been on crack, drunk or Chrysler must of had an overstock on those motors. Though they are very tough and will take a pounding but the trade off is not fuel economy and absolutely no power. Even with standard tires. I tied a rope to a gallon of milk and the Jeep couldn't move it.LOL The best set up I ever seen was a 95 YJ that had been switched over to a 289 Ford engine. The Jeep had 33" tires and got about 24 MPG and had power enough to snap axles. Remember an old saying that my Grand Daddy always told me about HP. It's always better to have way to much motor and have power if you need it rather than never have enough power and always be bogging down...
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Old 01-18-2011, 10:22 PM   #14
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dang guys i had a i6 and i now have a 2.5 and if u know wat ur doin there great engines i got 33s with 3 inch lift and i get 17mpg and poweer well is no v8 but u know how to drive it it does fine and fourwheelin ive done stuff the v8 couldnt do

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