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Old 02-28-2009, 12:58 PM   #6 (permalink)
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Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,521

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 52.71 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 70.75 mpg (US)

Appliance car - '14 Mitsubishi Mirage ES (base)
90 day: 52.48 mpg (US)
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"Worth it"? Depends on how much of a data nerd you are, and if you're up to the task of diagnosis if anything ever goes wrong with your vehicle. It can be really useful there.

A properly calibrated MPGuino will be more consistently accurate with fuel consumption readings than the SG, based on the different ways they calculate fuel use.

I've used my SG to diagnose a vacuum leak (via MAP readings) that didn't even set off a trouble code.

Originally Posted by jamesqf View Post
but the fuel consumption ones don't seem to be accurate at all. They'll give sometimes wildly different numbers than the Insight's internal gauges
I'm sure you already know the SG doesn't factor lean burn into its MPG calcs, right? The Guino does, however.

In my opinion, the SG's weak point is its calculations of non-stoich conditions MPG (including open loop during warm-up or strong acceleration).

When I get my $S@^ together, I'll have both the SG and Guino in my vehicle.
Project MPGiata! Mods for getting 50+ MPG from a 1990 Miata
Honda mods: Ecomodding my $800 Honda Fit 5-speed beater
Mitsu mods: 70 MPG in my ecomodded, dirt cheap, 3-cylinder Mirage.
Ecodriving test: Manual vs. automatic transmission MPG showdown

has launched a forum for the efficient new Mitsubishi Mirage - fuel efficiency info for Geo Metro owners - electric car conversion on a beer budget
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