Quote:
Originally Posted by bwilson4web
You are "Lola"? I notice you have your "City/Highway" set to 50/50%, the vehicle default. This means you need to exceed:
26 = 50% * 52 MPG
30 = 50% * 60 MPG
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56 MPG vs. 53.7 MPG
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I see this a lot, but 50% driving at 52 mpg and 50% driving at 60 mpg does not give an average fuel economy of 56 mpg.
If you drive 50 miles at 52 mpg, you consume 0.9615 gallons (50/52). If you then drive 50 miles at 60 mpg, you consume 0.8333 gallons (50/60). Combined, you have driven 100 miles and consumed 1.7949 gallons (50/52 + 50/60). This gives a combined fuel economy of 55.7 mpg.
This doesn't always make a big difference, but it can if there is a big spread between the two different fuel economies.