Quote:
Originally Posted by RobertSmalls
The engine by itself would be most efficient at full throttle, but most ECU's will enrich the mixture once you pass, oh, 3/4 throttle. As to how I accelerate slowly, well, even the 2.2L Subaru with its nice flat torque curve doesn't make much power at 1500-2200RPM. And my 1.0L Honda engine is even better.
How low can you go without lugging the engine? Do that, at full throttle.
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Robert,
I'm guessing that this method works best in a non-turbocharged engine. Of course there is a difficulty with opening up the throttle so much without spooling up the turbo and occasionally hitting boost stage. I think my mpg on the most recent tank, trying the above method backs that up, as I have dropped to a 25.13. And while that is still better than EPA, it is not as good as I can get. Whether it is due to the use of the turbo or my application of this method is another question. FWIW, I have also been shutting down at stoplights, when appropriate.
Of course, if the 2.2L you're talking about is force-fed also, then it's probably my technique.
Regarding coasting and shut down, I agree with nj1266 about the potential hazards of turning off the car in traffic. I coast in neutral when I can, although living and driving in a city like Chicago can make that a challenge. I also shut off the car when I know I'll be waiting more than just a moment or two at a stoplight (not well defined I know, but that is a play-it-by-ear type of call). I'm not saying it can't be done, I personally am not comfortable with it.