Gas Mileage?
 

Hello, i just bought a 4cyl mustang lx and i drove 75 city miles then about 100 miles on the highway which brought me to a half of a tank. Then i filled it up which was about 7 gallons which brings me to about 25 miles to the gallon on average. Does this seem right for the motor? ive never owned a 4cly mustang and im just wondering what you guys think. i also noticed at about 55 in 4th it kinda seems like the engine shimmies a little bit and im not sure if thats also a normal thing or if it needs a tuneup. thanks