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That's what I've been wondering about my Dad's 3-Litre Caravan. However, I don't have a lot of flat areas nearby that I know about to test this on being in Pennsylvania. I noticed that with the TPS being at 19, 20 or 21 and going at about 70 MPH on a Highway (There are some places where the speed limit is that high in PA) the Instant MPGs actually go in the upper 30s and lower 40s according to the ScanGauge II (Set at -5% or -4%)
That's with tires at 45 PSI, no roof-rack and with the middle and rear seats out.
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