I have found that over several different vehicles I could usually beat the old EPA highway ratings consistently whether it was city, highway, or combined.
Then the 10% ethanol came along and it got harder to beat the old EPA highway ratings.
The vehicles were
99 Ford F150
97 Nissan Altima
03 Toyota Tundra
05 Scion XB
94 Del Sol
Lately I have had a lot of fun with the Insight. Driving my local route using the back roads and driving while concentrating on the bar graph instantaneous fuel mileage indicator, I made a couple of local trips, and averaged 71.5 MPG. My overall mileage is about 56 MPG.
Driving my wifes Murano on the interstate (also has instantaneous mileage indicator) I managed to get 30 MPG on the interstate if I stuck to 60 MPH, with a slight increase in speed downhill, and a slight decrease in speed uphill.
I managed to get 28.5 going 65 and drafting 3 stripes behind a large truck on the same road.
The instantaneous bar graph helps a lot with throttle position, helping me keep throttle imputs very precise which helps a lot.
The Insight will get close to 60 if I keep my speeds below 65 MPH on the interstate. Thats in colder weather, but not really cold, about 45-50 degrees.
When it gets cold, the mileage takes a big hit during warm up.
In the insight I am just beginning to experiment with a grille block, and the improvement is significant. I am being very conservative, don't want to overheat that engine.
In my VX the mileage took a huge hit when I changed tires, from the stock Bridgestones to the Michelins, about 7 MPH loss in mileage, without weather influences.
Still, I missed this Lazarus post the first time...
Not a whole lot of entries for the Passat diesel wagons I choose, so I peeked at the sedans, too.
My '05: 37.7 mpg. 5.4 better than the average of the posted wagons, .6 better than the average of the posted sedans.
My (her's now) '97: 46.2 mpg. 2.9 better than the average of the posted wagons, 1.3 less than the '97 sedans, 2.4 less than the '96 sedans
If I lived out in the boonies, where there was no 10% ethanol, I could average over 100 MPG in the insight.
I would even choose a manual over an automatic transmission in that imaginary scenario, and maybe get 150 MPG.
The only fair comparison would be under identical circumstances, and I would be willing to bet those with the greatest percentage over EPA are in really ideal circumstances.
I greatly admire those members who have achieved some amazing numbers in many different cars, but they are not driving on the same fuel, climate conditions, or the same locality. I am sure my situation is not the worst but it is far from the best.