Why would my gas gauge show and read that I had more gas in my car than I actually do

Hello, Dave here, contributing to RepairPal and providing expert advice since 2010. First - the loss of power concern - sounds like something the engine's computer is measuring to learn about proper air - fuel - spark mixture is not accurate or is failing. This will require testing to find out what is happening, assessing if there are any diagnostic trouble codes set for analysis and seeing what is happening when the problem starts occurring. You'll need some professional guidance for this. The winding noise - could be tire noise, could be a wheel bearing noise, could be a transmission or differential noise. Hands on - ears on testing is needed - use that same technician to road test and hear that noise so a first hand opinion can be made. https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.