All EFI engines shut off the fuel injectors when the accelerator is released above a certain RPM or speed (varies by manufacturer). It's easier to detect on newer model cars with a digital instant fuel economy gauge where when cruising at 55 MPH and the accelerator pedal is released, the economy readout will shoot from 30 MPG to the highest number or the readout goes blank.

On an automatic transmission when the gear selector is placed in neutral at highway speed, the engine computer will allow the fuel injectors to fire again and actually raises the RPMs in anticipation of it being thrown into gear again. On a manual transmission when pressing in the clutch or placing gear selector in neutral, the engine RPMs will fall to idle where the engine computer will fire the injectors to maintain idle speed.

If you turn off the engine (with the key) while moving, the car will still keep moving, but you won't accelerate or maintain speed. If the engine is off, pressing the accelerator does nothing.

Does the a gasoline or diesel engine appy fuel at high speeds when not pressing the pedal and more
I am doing a development board for a IC with 36 WLCSP package. My PCB layout has 16 via over pads, minimum 0.1mm drill holes, 4-layers. I need to fabricate my PCB. And I could not find a exact pricing for PCBs in the required design quality. I sent sample Gerber file for some PCB manufacturers. And they replied with extreme high prices and I can't afford their pricing (eg: 200$ for 10 boards with 2.5cm * 2.5cm). And most of manufactures are not willing to share their pricing strategy to optimize my design.

My target is to deliver my demo board for the lowest price (to make it lower than 10$, while component cost around 6.5$) . So I need to keep the PCB cost lower than 2$ with the minimum area of 2cm * 2cm. 



Could I achieve that much lower PCB cost?
what are the possible PCB fabricators with lower cost with required technology?
What would be the unit PCB cost if fabricate at least 500 boards?
Feasibility of my project to make it under 10$?


Thank you
