The trip navigation accounts for things like temperature, elevation gain — my experiences over at least 20 trips beyond the 300+ mile total range have been that there is built-in conservativeness — even in a few cases where I thought I might have to do the last 20 miles a little slower than my usual 75mph I never even had to. The actual range and EPA ratings are surprisingly close — far better than my last car, a Prius that advertised 60mpg and really got more like 45mpg, whereas I often get more than 325 miles, and even in winter get maybe 20% less. So on long trips, mostly it's just a matter of learning that you can trust the trip meter, and that you do have options, and so on. Oh, and you said you were born in 1963? No way! (I was born in 1962)
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