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Unread 07-23-2010, 12:44 PM   #16
Imped
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Considering I get 17mpg with my correctly-geared TJ in mixed driving conditions, you should be able to do better.

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Unread 07-23-2010, 12:53 PM   #17
Farmdiesel
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I can tell ya with my 07 6sp w/ 4.10s and stock tires the best mpg I have got on a road trip was about 20.5 maybe 21. I plan on doing 33s and have a rusty's 2 inch coil lift now. Like the other guys said 35s are probably okay with 4.10s and a manual. 6th gear ratio is .84 vs. ~.68 OD ratio in the auto, so you will maintain higher rpms with manual (charts say about 2300 with 33s @65mph) . With relatively easy driving manners I would think 18mgs is possible with the new rubber. I think 3.73s are fine for 33s on mainly flat land, 4.10s do give ability for 35s IMHO..

Good luck
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Unread 07-23-2010, 12:53 PM   #18
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With 34s on the 410 gears, I was at 17.5 running 60 mph and driving for mileage. After the regear to 513s it dropped the the mid 15s under the same conditions. The regear cost me $1200 and I didn't really need it. It's not a real big deal, but it irks me that I believed those that claimed better mileage w/513s and I knew better, but did it anyway. DUMB ME
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Unread 07-23-2010, 01:04 PM   #19
MilitaryJK4455
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You guys are not listening to what we are saying just by reading some of these responses.... 3.73's or 4.10's in a STANDARD 6 speed transmission is just fine... You will get around 15 in town and 17-20 interstate depending how you drive.... This is not applicable with the AUTOMATIC transmission... An auto with 3.73's or 4.10's is going to be a dog with bad gas mileage... check out this chart...



-An automatic with 35's would have to gear to 4.56's just to get to the performance of a standard tranny with 3.73's and 35's.
-An automatic with 35's would have to gear to 5.13's just to get to the performance of a standard tranny with 4.10's and 35's.
-An automatic with 35's would have to gear to 5.38's just to get to the performance of a standard tranny with 4.88's and 35's.

-A standard tranny with 35's and 3.73's is a doable set up (not a dog).
-An auto tranny with 35's and 3.73's is a dog...
-A standard tranny with 35's and 4.10's is a decent set up (lower end of stock performance)
-An auto tranny with 35's and 4.10's is a dog...
-A standard tranny with 35's and 4.56's is a good set up (higher end of stock performance)
-An auto tranny with 35's and 4.56's is a doable set up (not a dog)
-A standard tranny with 35's and 4.88's is an ideal set up (lower end of high performance set up)
-An auto tranny with 35's and 4.88's is a doable set up (close to stock)
-A standard tranny with 5.13's should be running 37's (getting to the highest end of high performance)
-An auto tranny with5.13's has just gotten to a stock set up (the lower end of stock)

Catch my drift?

Even some of these calculations are giving the auto the benefit of the doubt...

Last edited by MilitaryJK4455; 07-23-2010 at 01:30 PM..
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Unread 07-23-2010, 01:10 PM   #20
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Read my last post !!!

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Unread 07-23-2010, 01:23 PM   #21
andrew c
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also, since we are talking about tires. i want to run 15 inch procomp soft 8s...4 wheel parts told me i would rub my caliper. ive heard i have to grind the caliper down..is this true or can i just get enough backspacing? what backspacing?
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Unread 07-23-2010, 01:24 PM   #22
MilitaryJK4455
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Quote:
Originally Posted by JIMBOX View Post
I've got a JK 4dr/w 33" tires, before I got about 17mpg, with stock 32"

Now I get about 16mpg, with 33", it varies all over !

JIMBO
These are all calculations for 35's...
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Unread 07-23-2010, 01:26 PM   #23
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Quote:
Originally Posted by andrew c View Post
also, since we are talking about tires. i want to run 15 inch procomp soft 8s...4 wheel parts told me i would rub my caliper. ive heard i have to grind the caliper down..is this true or can i just get enough backspacing? what backspacing?
I dunno about soft eights but I have heard that you cant run 15's without spacers because of the rubbing and Im not sure how many different choices you have with BS in soft 8's... Im sure someone will chime in though... I think its best to go up to 16's though.
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Unread 07-23-2010, 01:32 PM   #24
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I know that, but they're just calculations and the OP asked about 33/35" tires, I gave a REAL LIFE mpg reading for 33"

The 15" wheels will work, don't know why you want to bother, the tires are not that much cheaper that 16", but

If you go with 15" you'll need backspace of 3.75" or LESS to clear calipers, usually then no grinding, but

You'll have to decide if you think it's worth it 15"vs16", I don't

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Unread 07-23-2010, 01:38 PM   #25
MilitaryJK4455
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I run 35" tires with 3.73's and a six speed and I can easily maintain highway speeds at 18 mpg's.... With 4.10's you should be able to easily run 35's and be just fine And especially with you down there in the flat lands you would be happy with it.

^^^posted this in the beginning of the thread... To add to it... v v v

3.73's with 35's running 65 mph at 2500rpm in 5th gear getting 18.7 mpg's for almost 100 miles straight up and down hills (not constant hills)
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Unread 07-23-2010, 01:55 PM   #26
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Quote:
Originally Posted by MilitaryJK4455 View Post
I run 35" tires with 3.73's and a six speed and I can easily maintain highway speeds at 18 mpg's.... With 4.10's you should be able to easily run 35's and be just fine And especially with you down there in the flat lands you would be happy with it.

^^^posted this in the beginning of the thread... To add to it... v v v

3.73's with 35's running 65 mph at 2500rpm in 5th gear getting 18.7 mpg's for almost 100 miles straight up and down hills (not constant hills)
Agreed.... and to add to it..

I run 35's with 4.10's and while i can feel a difference since the tires it's not as dramatic as made out. I even have a superchips programmer that i've not installed yet, I will since i bought it but the jeep doesn't need it...
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Unread 07-23-2010, 02:46 PM   #27
drowe303
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Quote:
Originally Posted by 1398653 View Post
dont listen to these guys telling you to get 33s. If you plan on wheeling your jeep get 35s or 34s. 4.10s with manual and 35s will be fine. You wont win any races on the street but if you wanted to win races you would have bought a honda. I have 34s on 3.21 and it is liveable on the street. Off road it is not good enough for the wheeling I do so I am going to regear but I wuold think 4.10s would be fine off road. If you change your mind it is only about 1200 bucks for a reagear. Put 100 bucks a month away for a year and regrear. You can live with it for a year if you are not happy with performance. If you get 33s you will be ticked at your self and want bigger tires. now if you dont plan on wheeling than go ahead and get the 33s.
Haha really? A honda??
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Unread 07-23-2010, 02:48 PM   #28
MilitaryJK4455
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Haha really? A honda??
I was thinking the same thing... Why not say a mustang or a camaro or even a WRX... i mean come on... A HONDA!??!
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Unread 07-23-2010, 02:54 PM   #29
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Partner, you seem to be missing something !~!


He can drive it right off the showroom floor and "GO WHEELING"

There's no need to change the tire size, thats just up to the individual--

Big 33's are about as tall as most 35's, or haven't you noticed !!

JIMBO
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Unread 07-23-2010, 03:00 PM   #30
MilitaryJK4455
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Quote:
Originally Posted by JIMBOX View Post
Partner, you seem to be missing something !~!


He can drive it right off the showroom floor and "GO WHEELING"

There's no need to change the tire size, thats just up to the individual--

Big 33's are about as tall as most 35's, or haven't you noticed !!

JIMBO
I agree that he could wheel it like it is... But that is not what he asked... And Big 33's are pretty much super swampers and they still only usually measure a true 33 or a 34 maybe depending on which model you get... My 35's measure a 34 and 1/2 on a 9 inch rim...
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33" tires , 35" tires , 4.10 gears , gear tire question , JK Wrangler , wrangler

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