Hey guys, just bought a '98 civic lx 4cyl with 150k miles. It leaks oil at the valve cover and oil…

Hey guys, just bought a '98 civic lx 4cyl with 150k miles. It leaks oil at the valve cover and oil pan but I wasn't too worried, it only cost me $1k. Everything was going smoothly until I decided to drive it from Utah to Idaho. I drove and average speed of about 80 MPH and was disappointed to find I only got 27.7 mpg! I was really expecting to get about 45 mpg. Why could this be? I've also noticed the car doesn't seem to roll easily in neutral like other cars do.

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