2012 X35d with less than 500 miles.

I just did half of a roundtrip from Orange County to San Jose up highway 5, which is almost 400 miles. I went approx 80-85mph for most of the trip. 2 adults with luggage, 100 degree temps outside so AC on the entire time. 24mpg.

I was a bit disappointed as when I first bought the car I was getting 28mpg going from Carlsbad to Mission Viejo (70 mi)...but that was late evening, driving solo, cool temps...and I'd guess that I was probably going closer to 75mph.

*update* drove back from Monterey down to OC today. Looks like at 80-90mph gets around 24mpg, 70-80 gets around 25-28mpg, and 50-70 around 29-30mpg...

does that sound right?

Also I filled up at a gas station where diesel was $3.69 while premium was $4.29