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Old 11-27-2009, 03:19 AM   #1 (permalink)
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Hello Eco People :)

Hey there people, I just bought a new car a 2010 Mazda 3 GS 6 speed manual. My previous car was very good on gas so I basically floored it most of the time and not having to worry about gas. My previous car was a 1.5 L 4 cylinder. Now that I got a 2.5L and having to fill up 50 bucks which can only got 400 km I was broken hearted. Anyways, I recently just filled up and started following tips from this site, i shift at around 2k and cruise at around 1.5-1.8k(i used to shift at 3k) and i would anticipate red lights and such. I hate idiots who tailgates real close!

I have one question, having a new car and all I'm still in break in period and I was advised by friends and mechanics to have a couple of redline pulls from time to time to seat the pistons when the car and drivetrain is warmed up. I want to know how much a 5-10 sec accelearation affect my mpg assuming i'd do it 3x for the whole tank?

Also, i read about new cars right now not havign to warm up and just go drive slow, any evidence on this or reason?

Thanks

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Old 11-27-2009, 11:28 AM   #2 (permalink)
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I wouldn't worry too much about the redline versus a tank. It's better to break in the car well than not to, for MPG. However, I don't know how much you really need to do that anymore these days.

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Old 11-27-2009, 12:27 PM   #3 (permalink)
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Hi jazda - idling to warm up isn't needed, and some would argue it's actually bad for the engine. Start, wait a few seconds and drive gently (low load) until the temperature comes up.

Don't know if you read the Toronto Star's "Wheels" section, but Kenzie (engineering training) blogged about idling recently. You might like to see this post: Jim Kenzie's The Driver's Seat

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