I don't think a small exhaust manifold leak is going to affect your mpg. unless you have really poor maintenance or possibly a torque converter issue then it is 100% dependent upon how much you push the big pedal.
for example next time you drive try going really easy on the pedal and slow on the stop, coast as much as you can. you will see a difference.
basically drive like a 95 year old women who is in no rush to go anywhere.
for example next time you drive try going really easy on the pedal and slow on the stop, coast as much as you can. you will see a difference.
basically drive like a 95 year old women who is in no rush to go anywhere.