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I have one of the more original 2.2L Ecotecs. It is in a light Pontiac Sunfire tho (2300 pounds) so the car is very zippy and does get close to 40mpg (38.7 MPG avg) at 75mph on the 210 in Los Angeles.
The "buzz" that most people talk about is in high RPMS. At 1-3k rpms the engine is hardly noticable and really smooth. Yes, the city MPG drops considerably (I got 26MPG on city only) but highway I've gotten 47MPG going 50-55mph on flat roads in Iowa.
I've tested the 0-60mph and clocked 6.9 seconds with a friend timing. Even raced (to speed limit) a friend in Scion coup and passed him pretty easily. My sisters 05 sunfire auto tranny has a 8.0 sec 0-60. ??? I've got a manual tranny, maybe thats why. So anyway, that speed comes in very handy when trying to pass people and brings a surprised look to everyone who thinks you have a 12+ sec 0-60.
Top speed is limited at 110 - the gas petal just sinks in and doesn't work until you drop to 109. (innocent look)...
Engine temperature is 190F normally. If you sit in traffic it goes to 226+F before the fan turns on (having the AC on keeps the engine temp under 200 though).
And yes - changing oil on this thing is the best thing since sliced bread. Cartridge oil filter is hard to find and they are expensive $5-7. I suggest the Nappa Gold or the Purolator and *seriously* recommend you stay away from Fram - their oil filters for this car have cracked pieces of plastic that fall off + bad design. The oil sump for my car is 5.5 quarts so get used to buying 6 quarts. The UOAs are excellent even at 7500 miles.
This engine does not like being cold - lot of ticking and clacking on start up so let it warp up for a few seconds. A lot of 2.2L Ecotec owners have noticed more noise with lighter oils - GC or another heavier oil helps quiet that startup noise. I have not noticed much of a MPG difference between a light 5w30 and a heavy 0w30. The engine seems to high rev a little easier with a lighter oil though.
One thing I noticed - I keep getting better MPG as the car ages.
Hope this helps - Paul