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Old 10-09-2019, 09:54 PM   #20 (permalink)
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His (Benny) - '06 Honda Insight MT
Team Honda
Gen-1 Insights
Last 3: 78.73 mpg (US)

Hers (Colson) - '13 Volvo S60 T5
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90 day: 38.61 mpg (US)
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Yes, lowest RPM at wide open throttle is most efficient for acceleration too, but for most people that is just dogged slow, and only offers a slight efficiency advantage to peak BSFC acceleration. I tend to view the peak BSFC on my Insight (~2000 RPM) as the RPM I try not to exceed while accelerating. It's hard when the car has only 66 hp factory, but the mpgs are there. I surmise it would be the same with your Corolla, except that acceleration would be a bit faster due to your greater power. But for those who want to drive "normally" without nearly lugging the engine, peak BSFC is a pretty good compromise.

Peak BSFC also only works if you are at wide open throttle before enrichment. Usually this is around 75%-90% load, depending on the car. Anything past 90% and most cars start richening the fuel mixture, which reduces mpgs. A Scangauge is a great tool to have, but a bit pricey. The Torque Lite app (free) and a cheap bluetooth OBDII dongle ($10-$25) can show load and other parameters. The only downside to Torque is very inaccurate fuel economy readings compared to a Scangauge, but that doesn't matter since the Corolla already has fuel economy instrumentation.
2006 New Formula Red Honda Insight MT, 287k: (Build thread)

2013 Ember Black Volvo S60 automatic, 104k (Wife's car):
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