Had a unique opportunity last weekend to take both our Prii out on a weekend getaway. I thought this would be a good opportunity to see the improvement of fuel consumption of the 4th Gen Prius over the 3rd Gen Prius. It was mostly highway driving (probably 85-90% of the recorded distance). Speed limit was 110km/h (68mph). Yes there maybe differences in driving styles but DRCC was used for most of the trip by both drivers. Stats: 2016 Prius Touring (215/45R17 OEM rims/tires) set at factory spec 471.7km, 4.3L/100km, CAD$26.60, 21.798 litres (calc'd: 4.6L/100km) 294.8 miles, 55mpg, US$20.15, 5.759 gallons (calc'd: 51.2mpg) ----------------------------- 2010 Prius Technology Package (195/65R15 Nokian WRG3 set 36/34) 470.7km, 4.9L/100km, CAD$29.54, 24.171 litres (calc'd: 5.1L/100km) 294.2 miles, 48mpg, US$22.34, 6.386 gallons (calc'd: 46.1mpg) Basically, the 2016 Prius performed just over 10% better than the Gen 3. Keep in mind that the Gen 4 had the 17" alloys instead of the 15" alloys which reduces mpg and the Gen 3 had WRG3s which are different from the OEM Bridgestone Ecopias that came with the 2010 from the factory which may also reduce mpg. It's completely non scientific but I thought it was a fun chance to compare the two generations on the same trip.