What range do you get from a full tank? - Page 4

Jim314 · Aug 18th, 2011, 21:38

I always reset the ave mpg reading at each fuel fillup. Then I compare the computer value to the mpg calculated from the miles driven divided by gal of fuel to fill. It means that the readout will not give the average mpg since the beginning, but this can be calculated from total fuel and the odometer reading. I used to keep track of that but finally quit.

Resetting does not give a false reading, except to the extent that the computer mpg value is biased falsely high by something like 5 % or about 1.5 mpg. Meaning that if your computer mpg readout is 31.5 mpg then dividing the distance travelled in miles by the fuel to fill in gal would give 30.0 mpg.

The instantaneous mpg readout is the average over some short time interval like a few seconds. I think the instantaneous mpg is an interesting quantity and that is where I usually keep the display set.

moncman · Aug 18th, 2011, 22:41

Quote:

Originally Posted by v2cjb

how much does it cost everyone these days to fill your Xc90 fuel tanks?

Mine was on fumes the other day. Filled at the local Total garage at £135.9 per litre and managed to squeeze in £92.

v2cjb · Aug 19th, 2011, 19:07

Thanks moncman. was wondering how much as I am waiting for my new XC90 r design to arrive and was wondering how much more it will cost me to run than my year old audi a6 2.7 tdi s line.

Get about 500 miles from £90 in my audi so XC90 shouldnt be to much more to run.

Aug 18th, 2011, 21:38	#31
Jim314 Premier Member Last Online: Nov 20th, 2018 01:45 Join Date: Feb 2009 Location: Dallas, Texas	I always reset the ave mpg reading at each fuel fillup. Then I compare the computer value to the mpg calculated from the miles driven divided by gal of fuel to fill. It means that the readout will not give the average mpg since the beginning, but this can be calculated from total fuel and the odometer reading. I used to keep track of that but finally quit. Resetting does not give a false reading, except to the extent that the computer mpg value is biased falsely high by something like 5 % or about 1.5 mpg. Meaning that if your computer mpg readout is 31.5 mpg then dividing the distance travelled in miles by the fuel to fill in gal would give 30.0 mpg. The instantaneous mpg readout is the average over some short time interval like a few seconds. I think the instantaneous mpg is an interesting quantity and that is where I usually keep the display set. __________________ 2004 V70 2.4 petrol 170 5-spd auto (lost 2016 June, collision with deer) 2007 XC90 FWD 3.2 petrol 6-spd auto

Aug 19th, 2011, 19:07	#33
v2cjb Junior Member Last Online: Apr 4th, 2012 20:35 Join Date: May 2011 Location: penzance	Thanks moncman. was wondering how much as I am waiting for my new XC90 r design to arrive and was wondering how much more it will cost me to run than my year old audi a6 2.7 tdi s line. Get about 500 miles from £90 in my audi so XC90 shouldnt be to much more to run.

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