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Setting up the PLX Kiwi was a simple plug-and-play affair. We first located our test car's OBDII port (in most cases, located under the dash beneath the steering wheel), and connected the Kiwi. After finding a suitable mounting location for the device, we started the car up and were greeted with a warning screen, a green driving tip, and finally the main menu.
Selecting the Kiwi score option, we spent a few hours exploring the streets of San Francisco under the watchful eye of the Kiwi. At first, all was well. The Kiwi kept track of our throttle position, braking pressure, and speed. If we stabbed the throttle, our acceleration meter dropped, lowering our Kiwi score. If we jumped on the brakes, accelerated past 55 mph, or drove erratically, our Kiwi score dropped. However, by accelerating smoothly, keeping our speed in check, and anticipating stops early, we were able to raise our Kiwi score to a respectable 82 points. Upon stopping to check our fuel economy, we expected to see equally respectable miles per gallon, but what the Kiwi displayed was surprising.
The Kiwi was reporting that our test vehicle, a 2007 Chevrolet Aveo, averaged a meager 7 mpg. We knew that we'd get some variance from the EPA estimated 23 mpg city and 33 mpg highway, but we were confused by such low numbers. We attempted to raise the average miles per gallon with a few hours of highway driving, but were only able to get Kiwi to display a combined mpg of 14 mpg. At the pump, we calculated our actual mpg to be approximately 26 mpg.
Alarmed by the discrepancy between the actual mpg and the reported number, we called PLX tech support. After walking us through a simple diagnostic using the Kiwi's sensor menu, it was explained to us that our test vehicle wasn't reporting an airflow parameter that the Kiwi uses to calculate mpg and that the device was essentially making its best guess using the rest of the information available. Tech support then walked us through adjusting the discrepancy using a calibrate mpg option in the setup menu.
Instead of recalibrating the device, we chose to test it in another of our test vehicles, a Mazda CX-9. After connecting the Kiwi and confirming in the sensor menu that everything was in order, we drove the SUV around for a few hours and got a more reasonable 16.5 mpg (EPA rated 15 mpg city and 21 mpg highway).
We can't blame the Kiwi for the issues we had with our first test vehicle, as the Aveo simply didn't have all the sensors the Kiwi needed to accurately report miles per gallon. In the device's defense, the calibration option is as good of a solution as can be expected, but the conclusion we reached was that the Kiwi wasn't always as plug and play as it's advertised to be.
While we don't like the squishy buttons, the Kiwi has a nice-looking display and is very easy to operate. We like the one plug approach to setup, but, depending on your vehicle, calibration can be a chore. In vehicles with all of the requisite sensors, the Kiwi performs exactly as advertised. However, if your car has a good trip computer, some features of the Kiwi will be redundant.
We could argue that the driving techniques the Kiwi teaches are essentially common knowledge and could be learned for free, without the need for a $299 device. That doesn't mean that the Kiwi is worthless, but the key word when describing the Kiwi is "helps." The device's Achilles' heel is that it depends on the vehicle's sensors to report accurately and the driver's improving skill to be useful. For those of us with right feet made of lead, the Kiwi could pay for itself within the span of a year. However, if you're already a thrifty driver, piloting your vehicle to its maximum efficiency, the Kiwi will be very limited in how much it can improve your fuel economy.