cmgww
Full Member
Today I had another roadie from Indy to Fort Wayne. I filled up before I hit the highway. I did a little experiment...at various speeds I noted the instant MPGs. What I found was quite interesting....
At 68 mph i set the cruise. I was averaging 24 mpg, ranged from 20-25 given the slight hills and valleys. The same holds true for the rest of these speeds,
At 72, I averaged 23 mpg, from 19-24
At 75, nearly identical
At 79, I averaged 21.6 mpg, from 18-22.
Keep in mind this, on my trip up it was about 6 degrees. So don't pay attention to the low MPG numbers. I've seen my car get better as I put more miles on it. I averaged over 27 mpg earlier this week when it was nearly 30 degrees out, at around 75 mph.
That said, I was only gaining 2 mpg on average going 72 vs 79. Again this is not scientific by any means, but I did pay close attention.
The top speed of our GS is 162 mph, with only 270 HP. That is quite impressive. And that leads me to believe that the drag coefficient of this car is really good. I looked it up and it's 0.34, which isn't terrible but not the best, but its overall frontal area makes it pretty good in the drag coefficient dept.
I just wanted to post this...I know there are many variables. I am running on the Pirellis in the winter, aired up a bit high bc it has been so cold they drop on the road when I take it out of my garage.
Summary, I use a negligible amount more gas going 7 mph faster....over 110 miles. In my truck (2007 Sierra 1500) that MPG dropped 3-5 mpg going from 72-79.
Just a bored guy stuck in a hotel...having a few drinks.
At 68 mph i set the cruise. I was averaging 24 mpg, ranged from 20-25 given the slight hills and valleys. The same holds true for the rest of these speeds,
At 72, I averaged 23 mpg, from 19-24
At 75, nearly identical
At 79, I averaged 21.6 mpg, from 18-22.
Keep in mind this, on my trip up it was about 6 degrees. So don't pay attention to the low MPG numbers. I've seen my car get better as I put more miles on it. I averaged over 27 mpg earlier this week when it was nearly 30 degrees out, at around 75 mph.
That said, I was only gaining 2 mpg on average going 72 vs 79. Again this is not scientific by any means, but I did pay close attention.
The top speed of our GS is 162 mph, with only 270 HP. That is quite impressive. And that leads me to believe that the drag coefficient of this car is really good. I looked it up and it's 0.34, which isn't terrible but not the best, but its overall frontal area makes it pretty good in the drag coefficient dept.
I just wanted to post this...I know there are many variables. I am running on the Pirellis in the winter, aired up a bit high bc it has been so cold they drop on the road when I take it out of my garage.
Summary, I use a negligible amount more gas going 7 mph faster....over 110 miles. In my truck (2007 Sierra 1500) that MPG dropped 3-5 mpg going from 72-79.
Just a bored guy stuck in a hotel...having a few drinks.