318 MAX fuel economy builds?

Killer6 said
Truly the spring seat load is the force depressing the plunger as it bleeds off, which can be anywhere from a stk HP 340 @70#, to 140# for a decent dual spring × whatever rocker ratio. Once any preload has been bled off, then it does become a function of oil pressure & orifice dimension.
As to OE VVT/VTEC etc., they are specific & are sensitive to beyond parameter changes, they assume OE spec oil viscosity & monitor oil temp & pressure to adapt the controlling OCV's or magnetic actuators. Toyota,..yes Toyota, screwed the pooch when going for the gas mileage gold w/the Camry mill, and those systems wouldn't function on the reduced viscosity as factory filled & specified. The fix, go back to 10W-30, the system just wasn't calibrated for super light weight oil.
I'm curious to see how You & the OP fare in Your individual mpg quests.

I agree and understand that when I pick my oil weight, springs which will be stock hp and engine temp. What I get is what I will get. It isn't a computer program that's for sure. But I'll take whatever I get on top and hope for 20 on the road. My goal is 20 mpg on the open road and under 14 sec in the quarter. If I accomplish this I'll have a fine daily driver while I finish buying parts and building the car.

Thanks for the help and interest. This is the car.