[Rich807]

I live in Vegas & typically we get our fuel here from California (wish was not the case but it is what it is).

I definitely see a drastic difference in fuel economy directly related to how much I have the A/C compressor running. For instance, as soon as it's cool enough in the mornings to commute in without use of A/C, I see a gain in MPGs. Then, when it finally gets cool enough to go both to & from work without A/C, I see another boost in MPG.

My S-Drive 28i is definitely the most A/C MPG affected car I've ever owned in 3+ decades.