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Old 08-27-2020, 08:07 AM   #1
Drives: 2009 yaris
Join Date: Jun 2016
Location: delaware
Posts: 6
auto trans rpm lowering for mpg

what options do auto trans owners have to lower final drive rpm to increase mpg in second gen yaris?
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Old 08-27-2020, 08:53 AM   #2
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Drives: No longer own a yaris :(
Join Date: Mar 2012
Location: Ashland, VA
Posts: 680
Are there any except for driving slower or having different gearing?
I'm a hermit named Lee
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Old 08-27-2020, 09:09 AM   #3
Drives: 06 2ZR Turbo Yaris RS
Join Date: Aug 2017
Location: Fredericton, New Brunswick, Canada
Posts: 2,384
Like Leegamer says, "drive slower". You could drop the rpm marginally by installing larger tires, but then you'd be using more power to turn them, negating any fuel economy gains. Do you not already get excellent fuel economy? I have the auto in one of my Yari and fuel economy is exceptional. I haven't actually compared the rpm at say 110 kmh between my auto and manual. I should do that.

2006 Yaris 5 Door RS 2ZR-FE (2011 Corolla 1.8L) Swapped, Automatic, T-28 Turbocharged (8 psi), HSD MonoPro Coilovers, DIY W/M Injection, custom 3" cold air intake, custom 2.5" exhaust, TRD rear sway bar, Penguin Garage 13mm spacers (rear), custom Civic front lip, full repaint, Android 6.0 7" touchscreen, Rockford Fosgate speakers, tweeters, NVX underseat subwoofer
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Old 06-07-2023, 03:14 AM   #4
Drives: 2007 Toyota Yaris Sedan
Join Date: Feb 2019
Location: Harrisburg, PA
Posts: 131
larger tires. Trailer tires are taller, 195/65r15s are taller.
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