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Lil4X

Elio Addict
Joined
Apr 26, 2014
Messages
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Location
Houston, Republic of Texas
Agreed, an instantaneous mpg readout would be nice, but a cumulative mpg readout is more useful. While the total mpg resets itself every time you turn the ignition off, it gives you a better idea of your fuel consumption over the length of your trip, be it a short jaunt across town or a cross-country tour. "Instantaneous" can be a little misleading as it is a constantly-moving target.

Either way, it's going to need some kind of fuel flowmeter to measure fuel flow in real time. I've had them in my boats and they give you a quick look at your efficiency at various throttle settings. Now my boat (w/single Mercruiser 233, a 351 Ford engine) was most efficient at 22 kts, consuming about 9.5 GPH. Firewall the throttle, kick out the outdrive, and balance out the trim tabs and you'd hit 42 kts, but at the cost of 25 GPH. That gets expensive really fast, so if you're into cruising, you learn to take it a bit easier on the throttle. On the Lexi, I'd manage about 22 mpg on the 20-mile (each way) commute to church. With some discreet hypermiling (ignoring the cruise control that would slavishly maintain the speed limit at all costs) just maintaining a steady throttle position on the freeway and allowing the vehicle to fall off a couple of mph on hills, I could achieve a cumulative 27 mpg.

Connecting via Bluetooth to your OBDII port and installing the sofware on your smartphone might be the way to accomplish this - assuming the OBDII is reading fuel flow from the injectors. (??) It's not one of those instruments you have to watch constantly, but a quick look at the end of a trip helps train your right foot.
 
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