Quote:
Originally Posted by vvv90
I have to disagree with you based on my analysis. I guess every car is different.
Case in point:
My Vette has a wideband O2 sensor in it. So I can prove my point.
I can cruise at 1000-1200RPM at 50-55MPH, well below it's power band, and maintain a 14.7:1 AFR at cruise in 6th gear. AFR readings with some acceleration to maintain cruising speeds never dip below 13:1 AFR.
That's with a 31.9 MPG average measured over ~200 miles with ~420RWHP.
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I'd have to say a Corvette would be an exception, it's a very high-tier sports car. I'd imagine every RPM would be squeezed and teased for near-maximum power across the entire range, and would overall be running quite lean.
I've found in most cars that as long as the engine isn't 'under load' at cruising speeds, gentle acceleration will only bump consumption up by a notch. If the engine is already under load, trying to accelerate will cause that distinctive strain as the engine note drops half an octave and it starts bucketing fuel into the cylinders (mostly because the throttle is open far too wide for the engine speed, your cylinders are drawing air in at a slow rate but the ECU is reading a wide throttle so gives it a healthy kick of fuel. Mass-air sensors and such do cut back on this, but it's still definitely a factor).
Your 'best accelerating' consumption would definately be higher on the rev range, I let the revs run out to about 3000rpm before shifting when I'm running conservative, 7000rpm when I'm feeling naughty
. In that respect I agree with Marlinspike wholly.