In addition, between 3,000 and 6,000 feet the engine turned an extra 60 rpm, and fuel flow during the climb was reduced by 1.2 to 2.1 gph. At 5,000 feet, the oil temperature was 20 degrees cooler than it had been with the original system. Similar improvements have been reported on the some 300 systems already installed on Cessna 172s and 177s. The addition of the 180-hp 172s adds those airplanes to the list that already included the 150- and 160-hp Skyhawks. Price of the system for the Cherokees is $3,375; the Cessna system is priced at $3,355 plus shipping. Both come with a 60-day guarantee and a one-year manufacturer's warranty. For more information, call 877/693-7356 or log on to www.powerflowsystems.com.