"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.
Quote:
Originally Posted by jamesqf
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
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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.