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Thread: MPG poll
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Old 05-24-2005, 04:32 PM   #44
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Join Date: May 2005
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Location: Oregon, OR
What I Drive: 2005 ZX3 5spd

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Originally posted by StoneRyno
I'm not sure how much I'm pressing down on the gas petal, probably about 50%. I'm in 1st for only a couple seconds as it shoots up to 3000 rpms real quick. 2nd to 3rd is also pretty quick to 3000 rpms maybe like about 5 seconds at most? 3rd to 4th probably about the same time to 3000 rpms. At this point if I'm holding steady at 35mph+ I'll shift up to 5th. If I'm accellerating for speeds above 40mpg I'll wait to shift to 5th at 45mph+. I don't know as of yet if shifting pattern has any effect on mpg. This tank is close to fillup time. I may have 1mpg gain on this tank by guesstimation based on the gas gauge possion and the miles on the tank. Then again as someone pointed out that mpg can go up with a brand new car. I assume this may have something to do with breaking in the engine?

I only use second to get the car rolling off from dead stop, then immediately shift into second. I gradually give gas in 2nd, then shift into 3rd and then, I switch over to 75% gas rule. If I recall correctly, manual says avoid driving hard and avoid very steady speed driving during break in period. If I were you, I would just use different shifting habit every time for the remainder of the break in period. (i.e. use 4th cruising at 50mph for a bit, use 5th the other time, etc.)

On thing I noticed and I don't know why it does this. When I start the car after it has been sitting for a long time like over night or after work and the car hasn't been running for a good 4 hours or more, the engine starts off idling at close to 2000 rpms. After a couple minutes of driving and get stuck at my 1st stop light it idles at 750 rpms.
Every car does this. Cold block doesn't allow gasoline to atomize good enough to sustain a stable idle at regular speed. So the computer automatically fast-idles until the engine block is sufficiently warm. Don't even think about driving hard during this warm up phase. Better yet, wait a few minutes after the coolant gauge reads normal temperature before giving it any spirited driving. Engine is made of metal and it expands and contracts with changing temperature. It's designed in such way that optimal clearance between parts are obtained at normal operating temperature. Such thing like burning out in a parking lot after a cold start to show off is incredibly bad for your engine.
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