gas milage GX 2000

I have a 2000 Alero, standard 5 speed, 4 cylinder 2.4 twin cam.

I am Horrible with math.. and so could someone check my milage and see if this is correct.

I recorded recently my fuel consumption as such;
423 km/42 liters = 10.07 km/L

= 22.96 KM/Gallon

or
= 14 miles/Gallon?


Is this correct? I'm canadian so we dont work in Gallons or miles too often but I want to check my milage against the standards laid out by Aero owners in this forum.

If I'm correct than it would seem I'm getting horrible mileage. But I suspect my math is wrong. P.S. Not reading alot of good things about the alero but i just boguth mine and it seems to run perfect - gas milage aside.
please help...

Your mileage per gallon isn't that bad. It's about equivalent to what I'm getting with my 99, but I have the V6. Also, a lot of it has to do with how aggressive a driver you are.

Here are the figures:

423km x .621 = 262.7 miles
42 liters x .264 = 11.09 gallons

262.7miles / 11.09 gallons = 23.69 mpg