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I bought an Ultragauge early this year. Besides being cheaper, the display was bigger and it fit more gauges. Accuracy seems to be slightly off due to rounding but nothing significant, maybe a half mile over 200 mile trip. Then again the average MPG doesn't match up with the actual MPG from using the standard method(miles driven / gallons added). It's always a bit high. I've noted this most fillups and even recorded it. I need to compile the numbers to see if there is a fixed percentage or it's an error during certain operation.
With the Mazda5 I found there is a sweet spot at about 30-40% load where the timing advance hits 50-60 degrees and MPG shoots up into the 40's sometimes 50. I can't do too much about it in town or on the highway but I've managed to get fantastic mileage on country roads.
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-Allch Chcar
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