In the old days you could tell which side of a car the gas cap was on (most of the time), by where the exhaust was. Gas was on the opposite side.
Gas cap light on dash board | Jeep Wrangler Forums (JL / JLU) -- Rubicon, 4xe, 392, Sahara, Sport - JLwranglerforums.com
![What side of the car is the fuel cap on? This handy indicator will mean you never forget | Express.co.uk What side of the car is the fuel cap on? This handy indicator will mean you never forget | Express.co.uk](https://cdn.images.express.co.uk/img/dynamic/24/750x445/958358.jpg)