Have you ever found yourself tearing across a post-apocalyptic desert wasteland, desperately hoping that your fuel tank won’t run dry? Although not everyone spends their free time pondering Mad Max-related scenarios, we at CarGurus occasionally do. A few weeks ago, we discussed some of the best cars for a summer adventure, and one in particular caught our interest: the Volkswagen Golf SportWagen TDI. We pointed out that with it’s 14.6-gallon tank and great fuel economy, the SportWagen should be able to get you roughly 600 miles before needing a fill-up. That got us thinking—just how far can someone get on one tank of gas? We decided to look at the data to figure it out.