Nothing is broken, just some constructive criticism from an automotive enthusiast.
Would it be possible to add a drive train configuration to the list of car options? Much like there are engine options.
Many vehicles are sold in 2wd, 4wd and Awd all under the same make and model. This makes it rather hard to do an apples to apples comparison when judging one's fuel consumption.
A great example would be the Toyota Pickups, there are 2wds and 4wds all mixed up and greatly skewing the results if one were looking for just 4wd mileage.
And Maybe just nitpicking but what about an option for listing turbo models? For example the Subaru's, they are almost all going to be an H4 engine but a large percentage of them are going to have turbos once again skewing results.