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Scangauge and Ultragauge should be equally accurate. Be aware that some Toyotas have a glitch where they report 0.01 gph usage even with the engine off. My sister's 2002 has that.
The MPGuino is more accurate because it reads the fuel injector signal directly and bypasses the OBD system.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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