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An asymptotic decaying exponential is an accurate way to describe the fuel mileage of the Typ-1h. For example driving say, 50 miles, one might calculate a MPG number that\'s 2 or 3 times higher, say, 1000 MPG. As battery energy is depleted, the frequency of the engine duty cycle is increased. More fuel is used. at 75 miles, the MPG might be closer to 400 MPG. Again, we\'re using battery energy mostly, but turning the engine on more and more. Just over 100 miles we\'re just over 300 MPG, and just beyond 120 miles, we\'re around 300 MPG.
So why pick a number at 120 miles? Well, it\'s more than double of most available plug-in hybrid ranges that achieve over 100 MPG. It\'s three times the distance of the typical American daily commute. It\'s a meaningful distance that represents the driving needs of 99% of Americans on a daily basis. Sure, it\'s asymptotic, after 350-400 miles it eventually plummets to around 130 MPG at highway speeds where it will stay all day until you plug it back in and charge it up.