Sport-utility vehicles are the stereotypical gas-guzzling villains of the transportation industry. Though they've been demonized, scores of people rely on them due to their luxurious designs, supposed safety ratings and occasionally for their off-road capabilities. Naturally, when the auto industry began advertising SUV hybrids, green-conscious drivers thought they could have their cake and eat it too. Unfortunately, that's not the case. Hybrid SUVs are certainly better than the average SUV, but they almost never get better gas mileage than non-hybrid compact cars and certainly not good enough gas mileage to put a dent in the bigger issue of global warming.