I tried to post this in general motor section but It did not let me and needs help as soon as possible

So I hear piston engine actually consumes more fuel at high rpm and i tried to find this online but I didnt find any thing really clear answers for me.

I wondered if anyone could help me if this is true, and if anyone have actually data that compares this.

 

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The reasons and factors are highly varied. I recommend starting with research into the definition of Brake Specific Fuel Consumption. Additional reading would be into aerodynamic drag, drivetrain loss, fluid dynamics, thermal-dynamics, etc...

 

I think that Automatic vs. Manual is also a factor with regards to fuel consumption.

Maybe it's all in my head...but I tend to coast around in neutral when I'm driving a manual car (say while cruising down a hill for example)

I always imagined this helped with fuel consumption because you're less likely to have "lead foot" if coasting.

 

This is the worst thing you can do for fuel consumption. Grab your favorite obd2 data scanner, and start looking at your AFRs ... coast in neutral, then coast in gear. You will soon see why you are not doing yourself any good here.

Not to mention no driving school that I have ever seen or heard of will EVER reccomend you to coast in neutral.

 

Automatic vs manual does matter, but not for that reason.