With hundreds of car models and car brands deluging the market, finding the right vehicle can prove to a tough decision for consumers. This is where mpg comparisons come into the picture. Mpg comparisons provide consumers with a comprehensive study entailing various aspects of different cars. They include important factors such as mpg, safety features, air pollution and green house emissions. With the price of fuel soaring high, obviously every consumer would want to buy a vehicle that gives a good mpg. But it would be worthwhile to pay particular attention to other details also like the levels of harmful emissions.