Although there are some similarities, these two are different in most aspects such as model year, body structure, powertrain, starting price, horsepower, fuel economy, ground shadow size, and market segment. First of all, there is a notable difference in the starting price of the 2018 Honda Clarity Plug-in Hybrid, which is $34,100 less than the base MSRP of the 2022 Rivian R1T, which is four model years newer. Also, a major difference is in the body structure and in the size of the vehicles. The 2018 Clarity Plug-in Hybrid is a Sedan and is significantly smaller than the 2022 R1T, which is a Pickup. In addition, the R1T has a more powerful engine than the Clarity Plug-in Hybrid, but it gets 28 more miles on a gallon of fuel. Among similarities is the maximum occupancy.