The power steering system only develops those high pressures when the steering wheel is turned. When driving straight the pump is allowed to full bypass, only developing a max of 100 to 200psi.
Even then it still takes around 1 hp to turn it.
Pressure reduction will make absolutely no difference in MPG.
I am one of the few people to study the at rest state of power consumption on a Saginaw type 1 pump, here:
http://ecomodder.com/forum/showthrea...ing-29002.html
That lead me to this, the only way to further reduce parasitic P/S losses is to remove the pump from the system, here:
http://ecomodder.com/forum/showthrea...ion-32895.html
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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