Quote:
Originally Posted by grumpy in NH
Automatics typ are MORE efficient on the highway with a stick due to LESS mechanical losses thru the drivetrain with a lockup converter (yes I said automatic) ........ Recall that manual tranny's have all gears in constant meash and are often lubed with 85W gear lube (sim to a 40W motor oil - the weights dont directly translate across motor to lube oils) and tend to generate heat in OD gear and thus less efficiency.
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Incorrect.
Take Yaris as example:
5-speed manual is 21.7MPH/1000RPM (top gear) , 75W-90 (most likely dino) and 34/40 MPG.
4-speed auto is 22.2MPH, WS ATF (synthetic) and 34/39 MPH.
How can auto model rev less on highway (TQ lockup) with synthetic fluid but produce less MPG?