My LeSabre has the Instant MPG. It does give you an good idea of the mpg at
different speeds. I checked mine on the same stretch of highway at 70, 65,
60, but at 55 I feared for my life as other cars passed me. There was a 4
mph difference, but I still drive at 70. I hate going slow on an Interstate
with light traffic. The expense of getting speeding tickets is the only
thing that keeps me from going 80 or 90.
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