03 X90 T6 Poor Gas Mileage (any suggestions)

trstjohn · Post by **trstjohn** » 28 Feb 2011, 05:22

You're 100% right. I was initially getting great gas mileage for a couple weeks Not sure what's happening now, but i'm getting about 220 per tank again.. Most of my driving is going back and forth to work basically about 12 miles daily.

I really liked how you justified the costs for upgrading to some new O2 sensors.

Post by **precopster** » 28 Feb 2011, 05:51

My 960 with B6304S had original O2 sensor in it at 105K and it returned poor economy of 12-14mpg. After a change of the one O2 sensor fitted and some injector cleaner I noted increase in mileage and around 17-19mpg (still far from ideal)

The three wire O2 sensors are rated by Bosch at even lower mileage than the four wire ones.

I now have the head off and the carbon build up on the pistons required some work to remove. Was the O2 sensor to blame?? Who knows.

All I know is it was running very rich for a very long time.

When I re-assemble it I'll run some more figures without the carbon also with a new air cleaner.

TJMAS · Post by **TJMAS** » 02 Mar 2011, 12:20

16541 Volvo Oxygen Sensor rear (S80 XC90) - Bosch 16541 (1) @ $86.34 Amazon
Can't find a listing for this one at Amazon or any of the other sites. Is the number right? Looking for rear OEM for 03 xc90.

trstjohn · Post by **trstjohn** » 02 Mar 2011, 16:01

I think amazon is out of stock on this item. You'll have to get it elsewhere.

Post by **gshadow325** » 02 Mar 2011, 18:10

TJMAS wrote:16541 Volvo Oxygen Sensor rear (S80 XC90) - Bosch 16541 (1) @ $86.34 Amazon
Can't find a listing for this one at Amazon or any of the other sites. Is the number right? Looking for rear OEM for 03 xc90.

WinterDriver · Post by **WinterDriver** » 03 Mar 2011, 12:28

I notice that you were not using premium fuel all along? That changes your mileage as well I suggest always filling it with premium for best economy.

trstjohn · Post by **trstjohn** » 04 Mar 2011, 05:42

Are only the later model XC90's OK to use regular fuel with?

WinterDriver · Post by **WinterDriver** » 04 Mar 2011, 08:22

No, Your Xc90 can take 87,89,and 93. The XC90 has an antiknock sensor. But the Volvo xc90 calls for 91, so what I do is put half 89,and half 93 and i get good mileage. When you put the lower grade gas in you get worse gas mileage.
Look in your owners manual at fueling.

Post by **gshadow325** » 10 Mar 2011, 05:37

WinterDriver wrote:No, Your Xc90 can take 87,89,and 93. The XC90 has an antiknock sensor. But the Volvo xc90 calls for 91, so what I do is put half 89,and half 93 and i get good mileage. When you put the lower grade gas in you get worse gas mileage.
Look in your owners manual at fueling.

ok so 91 should get me better mpg?

Lets say it get at least the same.

fuel is now $3.50 87 and $3.75 for 91

$3.50 gal / 20.4mpg = $0.17 per mile

to get to $0.17 per mile car has do get a average of 2 more miles per gallon

$3.75 gal / 22.4mpg = $0.17 per mile

Do i think that is attainable? Dont know until the next road trip.

trstjohn · Post by **trstjohn** » 10 Mar 2011, 05:41

So you're getting 20MPG's now that you have changed your 02 sensors?

03 X90 T6 Poor Gas Mileage (any suggestions)

Re: 03 X90 T6 Poor Gas Mileage (any suggestions)