mixed driving I get about 22 mpg. If all highway it is closer to 25. More local, closer to 19. I did lose about 1.5 mpg when I installed my Yakima basket on the roof. I cannot seem to notice a difference in the fuel I use. I will be taking a trip to Maine in a few months but we will be loaded down with me, 3 kids and camping equipment for a week on the roof and on a rear mounted basket. I am sure that will all bring down the highway mpg, but I am also hoping for something consistent in the 22-23 mpg range.
My XC70's dash reads consistently low of reality. Anywhere from 1-3mpg low. I recently got 28.5mpg (real, the dash claimed 25.5) through a 1-hr traffic delay and up/down several mountain passes. 25.0mpg avg over the 8821mi I've had it, mostly highway driving (and not calibrated for the summer tires being plus-sized, so closer to 25.4mpg overall average). My V70 NA gets 32mpg+ highway, but its overall average the last 2 years (all in CO, and I daily this car so probably 50/50 highway/city split) is 24.7. No trip computer on it.
Current on the XC claims to be 24.8, mostly highway. Based on the gas gage position vs miles on the tank for the V70, it's right around 25 right now, mostly commuting (which is 2/3 city 1/3 highway).
My average just went up to 17.9mpg over the weekend . I may actually get over 300mi out of the current tank. Suprised as this is the same tank I've ran on my most recent trip, the canoe must improve the aerodynamics of the brick.
I don't have mileage computer on my s60 base non turbo, m56, so i always just use kms per tank method.
And because i'm a hyper miler I'll lift throttle any chance i get. ;-)
Sooooo, Last weekend with mostly hwy driving a/c cranked i knocked out 800kms or 500miles on a tank. No low fuel indicator on.. Pretty good i think.
Pretty much same mileage i was getting with crapped out old Ford focus and no a/c.
And very solid engine,, that 5cyl non turbo gets better with the use!