[elemein]

Sorry for making this my first post; but I have a question I've been wanting an answer to for months now, and I just can't seem to find the answer for the life of me. I've asked my automotive teacher and my physics teacher, yet no one seems to know (yes I'm still a highschool student.) So I thought: "What better place to ask about fuel consumption than a forum revolving around exactly that?"

So here is my question.

Let's say I am driving a car with a 1.0 L engine (quite small; a Geo Metro perhaps?) I am cruising at 2000 RPM and have the throttle down at 20%. Let's say that the engine is currently running at 80% Volumetric Efficiency, and, it is also running a bit lean at a 15.5:1 A/F ratio.

How much fuel would I use?

Well, with MY understanding, here is my math.

1.0 L = 1000cc
2000 RPM = 1000 RPM worth of combustions as every cylinder fires only after every 2 RPM; therefore, 2000/2 is 1000.
-- So;

Fuel Consumption = 1000 (cc) * 0.20 (20% throttle) * 0.80 (80% VE) * 1000 (RPM worth of combustions) / 15.5 (:1 A/F ratio)
= 200 (cc) * 0.80 * 1000 / 15.5
= 160 (cc) * 1000 / 15.5
= 160,000 (cc) / 15.5
= 10,322.58 (cc)

So over one minute, I am using 10,322.58 cc's of fuel? Or over 10 litres of fuel per minute? That just seems absolutely insane! My math MUST be wrong!

Can someone please explain where I went wrong or perhaps supply the right way to figure this stuff out?

Thank you!