I just returned from a ski trip to Big Sky MT starting in Wisconsin for a total 2900 miles. I have an Ultraguage II mounted on my dash. It gives instantaneous MPG along with cumulative MPG, ave MPG per tank etc. On the way out with a head wind and storm, cruising about 70 mpg I averaged 28.2 MPG (2003 5 Speed, FWD). On the return trip I averaged 31.6 with a tailwind almost all the way driving about 75MPH. The manual tranny gets 2 or 3 mpg better than the auto in real life driving, the FWD adds 2 or 3 more so one expects mpg to be higher than AWD and Auto. Having said that I can say the ultraguage is a big factor in improving MPG because you can see where the mpg losses are immediately. At one point during the trip the head wind was 40 mph. My gas mileage dropped to 22mpg at 70 mph, slowing to 55 improved it to 29, a big difference. If you are really nerdy and you want to optimize mpg, hypermiling down the long descents increases your mpg to 350 mpg at 75 mph (no kidding). This has a big effect on average mpg. My point of all this is there is real value in getting one of these guages if you want to see where the big losses and gains are in assessing MPG. I am sure there are other tools out there similar to the Ultraguage but these gadgets are kind of fun for an intuitive understanding of mpg. The big issue with the RAV4 is lack of aerodynamics. The short stubby profile creates a lot of drag behind the car which is why wind speed is such a big factor.