I have been having some issues over the past few weeks with my cruze. I will get random times, usually extended periods of time where my car will have bad mpg 10-20 at best( usually 45-55 mpg) and awful power, for example today I floored it on the highway for about ten seconds and the car went from 68mph to 71mph. The most common thing I’ve seen during my search for an answer is people filling up their gas, this is happening around the time I do that but also other times as well, like when the tank is half empty. I consistently use the same gas( ultra or whatever it’s called). Early this year my oil pump blew and I am worried about the engine, wondering if this could be bad compression from a piston. I moved about a month and am driving the car more, so the issue could have been present before and I probably wouldn’t have noticed as the car wasn’t used for more then a five or ten minute drive most days, but I’m driving an hour a day now. Any ideas would be helpful, I do plan to have the dealer look at it as it is still within warranty.