View Single Post
Old 10-09-2019, 09:54 PM   #20 (permalink)
mpg_numbers_guy
Master EcoModder
 
mpg_numbers_guy's Avatar
 
Join Date: Feb 2018
Location: VA
Posts: 1,316

His (Benny) - '06 Honda Insight MT
Team Honda
Gen-1 Insights
Last 3: 78.73 mpg (US)

Hers (Colson) - '13 Volvo S60 T5
Team Turbocharged!
90 day: 38.61 mpg (US)
Thanks: 311
Thanked 452 Times in 344 Posts
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):
  Reply With Quote
The Following 2 Users Say Thank You to mpg_numbers_guy For This Useful Post:
#SaveTheManuals (10-10-2019), MetroMPG (10-10-2019)