I don't get it...Turbo with Shell V Power Nitro+ 93, average highway speed is 72-75, and I *struggle* to reach 25 mpg. I'm gentle on the throttle, too. What gives?
I'm the same way.
25MPG at those speeds is pretty good. I rarely get on a highway greater than 55MPH, and 23MPG is pretty much where I run on a routine basis, even when I'm gentle on the throttle. I've got 7,700 miles on my car and have never hit 25 on the computer mileage. I've had a few recent tanks where I've driven it hard, but most of them when I've been 100% conservative.
Personally, I think it has to do with atmospherics (temp, humidity, pressure), road surface-type friction for these specific tires, and goodness-knows-what-else.
I drove 12 miles to church this morning--37° out--and Fuel Monitor said 16.5 MPG.
I drove there this afternoon for an even--50° out--and got 24.5 MPG.
Exact same route.
Intentionally the exact same driving style.
No traffic to speak of here in the country, so that was not a factor.
We've had this conversation here before.
You'll not get an answer...there is none.