I added Marvel Mystery Oil to my 2001 Dodge Ram to see if it actually improves fuel mileage. After driving and tracking my MPG, here’s what I found: ✅ Did I get better gas mileage? ✅ Any performance improvements? ✅ Does Marvel Mystery Oil really clean the engine? ✅ Would I recommend it for better fuel economy? After this test, my MPG is roughly 15 miles per gallon. But was it worth adding Marvel Mystery Oil? Watch to find out! 💥 Have you ever tried MMO? Let me know your experience in the comments!