What's the most efficient RPM for Mazda3 hatchback?

[Zerfman34]

for the rpm thing, a SGII or similar device will help you figure out exactly what range your car likes best. speed vs. fuel rate (MPH/GPH = MPG) is all you care about. while RPM's certainly have a large effect on fuel rate, they aren't what you care about for fuel efficiency.

[buffel60]

THE BEST RPM for unbeatable consumption is 0.

Use public transport or get a lift (lift your feet and walk!)

If only it was this simple...