Hi all I just want to open this new thread to post some "hardcore" P&G tests I made so far with my 2010 Prius. New posts and suggestions are welcome. When I say "extreme" in the thread title I mean that I try to find out the best road conditions (no cars and no traffic lights), the best P&G and the best car setting to maximize fuel economy. During these tests I had to consider: no gradient paths in favor (ex: start the test at 10m, end at 10m high). overall consumption of traction battery = 0 (ex: beginning SOC=55%, ending SOC=55%, SGII is very useful here). commutes should be far enough to find out a reliable average (I would say at least 20 km that is around 12 miles). Beginning and ending speed must be the same (starting from 0 km/h, ending at 0 km/h for example). The first test I made was at the end of march 2011, one month ago. the P&G I used was the following: accelerate from 35 to 57 km/h (22 to 35 mph) with ICE running at 1360 rpm or so. In this way I could complete almost every P&G cycle with energy balance "from" and "towards" battery = 0. I tried to keep the SOC at 58%. The result is shown here: TripB: 62.3 km (38.5 miles) - Cons. 2.6 l/100km (90.5 mpg) - AVG 40 km/h (25 mph). Outside air temperature was 8Â°C (46Â°F). To keep ICE coolant between 85-87Â°C (185-190Â°F) I had to use lower grill blocking, covering about 50% of the surface. **************************************************** Since I have a target of 2.0 l/100km (117.6 mpg), this early morning coming back from a club, I tried some more tests, hoping that warmer temps could help me to do a better job. I made 3 different P&G tests: P&G from 35 to 50 km/h (22 to 31 mph) and SOC = 60% TripB: 18.1 km (11.3 miles) - Cons. 2.3 l/100km (102.3 mpg) - AVG 37 km/h (23 mph). P&G from 35 to 50 km/h (22 to 31 mph) and SOC = 45% TripB: 17.6 km (10.9 miles) - Cons. 2.4 l/100km (98 mpg) - AVG 38 km/h (24 mph). P&G from 35 to 68 km/h (22 to 42 mph) and SOC = 55% TripB: 21.6 km (13.4 miles) - Cons. 2.5 l/100km (94.1 mpg) - AVG 46 km/h (28.6 mph). In all tests I used to pulse at 1800 - 2000 rpm, to keep ICE at the most efficient speed: I guess you all know the 2ZR-FXE chart that Ken1984 showed us: where is clear that the most efficient 220 g/kWh area is between 1250 to 3000 rpm: Thanks again Ken. For these tests: 15Â°C (59Â°F) outside temp - with no wind - on the same flat roads - starting and ending at the same place, with the same speed and with the same SOC. In the second test where SOC = 45% I noticed that during the pulse phase more ICE energy went to the battery. I think that this was the reason why I had a worse fuel economy result than the first one. The car has more or less 19500 miles and has a solar roof. Tires (Bridgestone Eco Pia B250 195/65 15) were inflated 2.9 bar (42 psi) front and 2.8 bar (40.6 psi) rear. I know that someone got 2.0 l/100km (=50 km/l =118 mpg), so now I'm wondering what there's to improve on the things written above to reach such a great result. - Maybe a warmer outside temp can help? With no grill blocking ICE coolant was at 80Â°C (176Â°F) with 15Â°C outside, perhaps a 88-90Â°C coolant temp would give a better ICE efficiency. - Maybe a different P&G speed range? Suggestions are welcome. Bye PS: I wanted to share my driving experiences with you, but I apologize for my english, I know it's not good: I didn't have the chance to practice a lot.