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06-15-2017, 01:40 PM | #1 |
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Anyone look into changing the rear end ratio to improve gas mileage ??
Anyone out there ever thought about this ?? Is it even possible to purchase a different gear set that would improve gas mileage ?? I'm talking about a 3.0 si X5 model.
Regards wjibby
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06-15-2017, 01:57 PM | #2 |
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Since the car is AWD, you can't change just the rear diff alone. Final drive is determined from the final drive of the axles putting power to the ground. You'd have to change the front too. Then figure out if the transfer case ratio can stay or not.
About the only option for you is to change cars. Let's face it the X5 is not known for good mileage. Or somehow remove more than 1000lbs from the car, which might give you a 3-5MPG bump. |
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06-16-2017, 10:51 AM | #3 |
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If you're complaining about economy in a 3.0 X5 then you should probably look into getting a hybrid or small minivan, as the 3.0 is as low as its going to get when it comes to fuel usage.
Changing the gar ratios is not a a viable option in the X-Drive cars. For as much as it would cost and the net increase in fuel mileage, you could probably buy 5 years worth of fuel. |
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06-16-2017, 01:24 PM | #4 |
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I did this on my 92 Ford Exploder when I put a Rancho kit and 31" tires, but that was done more to compensate for the tires than for fuel economy.
These vehicles nowadays are much more precise and aren't likely to enjoy being tinkered with. Unfortunately, this is the nature of the beast (no pun intended)
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06-17-2017, 01:44 PM | #5 |
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Yeah the newer car have more gears which generally should equal better gas mileage plus turbos etc. The 3.0si isn't bad though. My wife's would get 28-30 mpg on the highway in Florida with drop in filter. When I threw on roof racks it dropped to 24mpg highway. We get 21mpg mixed here in Hawaii and it has the PBX tune. This thing gets great MPG for a 5k lb truck!
OP, maybe you're having other issues to resolve. Maybe get a drop in filter like K&N and swap spark plugs. Then reset the tranny and see how it goes. Also, make sure you have all of your panels under the car. The whole bottom should be covered in plastic except under the muffler. Missing one can affect the MPG. The tires could be affecting you also. |
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08-05-2017, 08:51 AM | #6 |
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Tips for better gas mileage.
Well I have to learn how to drive the X5 and how to get the most out of it. I have found the following....
1. Use the cruise control as much as you can. 2. take you foot of the gas and shift to the next gear at 2K rpm 3. Use manual trans going down hill to save on the brakes. Remember, I have a 3.0 si which is not that good on gas mileage. We tend to be foot on the gas drivers. 2K rpm is optimum for best gas mileage. Hope this helps someone... Regards wjibby
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08-30-2017, 11:38 AM | #9 |
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"3. Use manual trans going down hill to save on the brakes."
This is a Great Idea if you like to change TRANSMISSIONS! I prefer to change brake pads and rotors. Brakes are for Stop, Gas is for Go.
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08-31-2017, 08:33 AM | #10 | |
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Quote:
Edit: Ha! I just realized you meant that if you use shifttronic you will destroy your tranny...I'm not sure using the transmission for its intended function would damage it as long as you use it appropriately. Preventative maintenance should help...swap the fluid at regular intervals. Have you heard about a lot of tranny failures? I've read of some failures on the 07-08 models from defects but not a lot of usage failures. Last edited by jandref321; 08-31-2017 at 08:49 AM.. |
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09-14-2017, 10:43 PM | #11 |
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Then there's me over here, red light and freeway racing anyone I think is worthy, getting MAYBE 11mpg...life's too short, YOLO. I hope you're at least still putting in premium fuel because the .20 per gallon you save by using lower grade is really only going to equate to lower MPG as well, so you're ultimately better off using the premium fuel the vehicle is tuned for.
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