I took the plunge and have installed PP Ultra with the Pureplus in my 06 Saturn Relay. The van went 2200 miles and according to my wife, she was able to go from the SF Bay Area to Bend Oregon on 1 tank of fuel! With about 3 gallons out of 25 remaining, the van did very well! Usualy it has to be filled up around Klamath Falls. (the 2200 wasn't just to bend, or, it was regular driving around too, the road trip just added a thousand miles to it before I checked). The engine for sure does sound different, it seems to just idle easier now and revs up just a bit easier. I'll say the PPU is at work there! When my wife got back, the stick was a half quart low! This van for 98,000 miles has been fed Synpower 5w30. On synpower it uses up 1 quart every 7000 miles. I topped it back up and will wait & see what happens! on my friends 2000 Firebird (3.8L), I put PYB in instead of Mobil super 5000. in 700 miles it used up 1 quart. With Mobil Super it used up 1 quart every 2100. I topped it back off and am keeping an eye on it. This is normal when you change oil brands? Or is the Pennzoil just cleaning up so much the oil's finding its way out?