[brainf18]

Took my car in for the 10K service back in Nov. Prior to service I was averaging 24 mpg. After service averaging 21.5 mpg. Tire psi the same and all other variables (as much as feasible are the same) Apart from colder temps I can't figure out why its so much worse.

Maybe they used a heavier weight oil during the oil change but that shouldn't make such a drastic difference.

Thoughts from others?....