My normal commute gives me about 17mpg in pure Sport. Eco Pro typically gives me about 21mpg, and if I really, really lean into it I can get about 25mpg on a tank (all in-town commute, 35-40mph, stop-and-go, with a visit to a 3rd floor on a parking garage 2x a week).

If I drive 80mi/week, I consume 4.7gal/week normally, or 3.2gal/week on my best-ever Eco Pro run. Lets say 91 octane is $5.80/gal, that would mean it would cost me $27.26/week in gas normally, or $18.56 on full Eco Pro.

So, it would save me around $8.70/week or around $452.40/yr if I were to drive my beautiful Estoril Blue 435i MSport 6-speed like a hyper-miling octogenarian with glaucoma. My dad had a saying he would drop every time we saw a guy driving a Corvette 5mph under the speed limit: “what a waste of a perfectly good sports car”.

If I wanted to conserve fuel really bad, I’d get a 330e or an i3 and just keep it charged up. Even with our crazy costs/kwhr in California and my SOs lead foot, the cost to roll our i3 down the road was about 25% the cost per mile of my 435i on a good day. That’s $27.26/week or $965/yr to limp my 435i along, versus $6.81/week or $352/yr to operate an i3 like I stole it. And that yearly delta? 1-2 payments on either vehicle, which is why I find it so impractical for me to switch.