10 seconds on google pops up a link to JDPower and Associates...tells us:
According to the EPA, the 2008 Mazda CX-7 with 2WD consumes 18 barrels of petroleum per year, while the 4WD version consumes 19 barrels per year. This results in a carbon footprint rating of 9.6 tons of CO2 output per year for the 2WD model and 10.2 tons of CO2 output per year for the 4WD version. The Mazda CX-7’s national air pollution score is 6 out of 10, with 10 being the best. In California and New England, its air pollution score also is 6.
In Australia, they convert it for you:
Research the new 2006 Mazda CX-7 Sport Utility Vehicle with all the information required to assist in making your buying decisions. With prices starting at $41,140 the Mazda CX-7 comes standard with Seating: five seats , a 2.3 litre 4 cylinder engine , Four-wheel ABS , Power steering , Electronic traction control via ABS & engine management , Cruise control , Full car warranty: duration (months): 36 or distance (miles): Unlimited, distance (km): Unlimited . The Mazda CX-7 offers Automatic 6 speed transmissions, CO2 emissions of 273 Grams per kilometer , fuel economy of 11.5 Litres per 100km and Performance: acceleration 0-100 km/h (secs): 8.5 . You can compare the Mazda CX-7 with other CX-7 variants or with other similar cars from other make and models. Find photos, videos, specs, safety ratings, manufacturer specials and locate your local Mazda dealership.
So, lets break it down:
2WD Manual: 243 g/km
4WD Manual: 265 g/km
2WD Automatic: 261 g/km
4WD Automatic: 273 g/km
I'm not saying by any means these are accurate as I've pulled them from the internet and are basically different enthusiast magazines quoting these. For best results you'll want to contact Mazda.