Mazda CX-7 Engine Problems

I CONTACTED Mazda and was told no upgrade is available for the CX7.

YOU have to be cautious about the fuel consumption figures car companies quote as they come from standard tests over a particular test cycle on a dynamometer. They're really for comparison purposes. You can use them to compare make for make, model for model, and they are an indication of improvements a carmaker has made in going from one model to the next. I don't put a lot of store in them in an outright sense. Crossover wagons like yours tend to use more fuel than a regular sedan because they tend to be heavier and carry a lot more mechanical gear. There are also things such as larger tyres. If you feel you have been duped, I suggest you seek advice from a government consumer affairs department, or a solicitor experienced in consumers' rights.