greenMeter is an app for the iPhone and iPod Touch that can compute your vehicle's power and fuel usage characteristics, and help evaluate your driving style to increase efficiency, reduce fuel consumption and cost, and lower your environmental impact.
Based on the gMeter vehicle performance app, greenMeter uses the device's int ernal accelerometer to measure forward acceleration and compute engine power, fuel economy, fuel cost, carbon footprint, and oil (barrels) consumption.
You can learn from greenMeter before you even get in the car. By tipping the device forward and backward to simulate acceleration, you can study the graphs in greenMeter to see the effects of acceleration, aerodynamic drag, and rolling resistance across the speed range. Then implement your knowledge on the road, by choosing an efficient cruising speed and using the built-in g meter to limit acceleration while you drive.
greenMeter can compute data in US or metric units.The software offers two calibration options for the accelerometer, one to correct internal offsets, and the other to set the forward direction when the device is positioned in a vehicle. Settings and preferences (including inputs to specify vehicle, weather, and fuel characteristics) are accessed from the "i" button. To switch between the various graph modes, just tap the display. Please visit the greenMeter website for technical details, setup/usage instructions, and more info.
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