[cyclopathic]

I am looking to replace the OEM Shunt type R/R with series unit, and if my math correct depending on speed this should give me 3-13% MPG improvement?

OEM stator is rated at 35A (420w) and this is constant load due to shunt type R/R. The actual electric load is 190w less, which with series unit should reduce engine drag by 0.26hp.

Per calculator depending on speed (35-65mph) road+aero load is 2-10.3hp, so the 1/4hp drag reduction should give ~3-13% improvements.

Am I missing something?

I suppose at lower speed the stator output will be less than max, so 13% is over-estimate.