The cost of DC fast charging in parts of the US (i.e Florida) are actually more expensive than gas.
Let's look at a RAV4 Prime (36-38mpg on the highway) compared to say a Model Y (let's use 3.6 mi/kWh) with current AAA Florida gas prices at $3.46 (
AAA Gas Prices) with a DC charging rate of $0.43/kWh (pretty normal for Florida... sometimes $0.52/kWh and sometimes in the 30s)
The RAV4 Prime is cheaper on the road trip and you don't have to stop every 200 miles and the suspension isn't rock hard.
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CCS charging network is terrible but let's be honest.. the ride quality of the Tesla for long trips is pretty mediocre and due to increased Supercharger rates it's not cheaper to road trip either. Home/work charging is where the big savings lie.
My next Tesla will probably be an Model S... a friend who owned a 3 and Y basically has convinced me. He hates the ride quality of the 3 and Y and swears by the S's air suspension.