On instant mine does the same thing, jumps all over. I set mine to average but it lies anyways. Let's just say it a very optimistic number.
I keep track of fuel used and miles traveled and then calculate it by hand. At 80,000 miles now and averaged 7.1 over those miles.
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2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS
Criticism is easier than Craftsmanship
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