I combined the 2021 and 2022 data for electric vehicles: Data on Cars used for Testing Fuel Economy | US EPA So I plotted the MPGe vs test vehicle weight to get this chart: I dropped any below 60 MPGe since such inefficient vehicles might as well drive around with their brakes on. There appears to be a sweet spot between 3750-4250 lbs (1705-1932 kg). Above this weight, the efficiency takes a dive. Below that weight, the vehicle size probably has aerodynamic problems leading to less efficiency. I made a fresh chart using the same spreadsheet using one of two test protocols and plotting both MPGe and "Tesla" MPGe: Tesla engineering is focused on vehicle and drivetrain efficiency. The other EV makers with legacy design rules, not so much. My suspicion is they outsourced the drivetrain technology but it could also be legacy design rules. Tesla engineering has a moat, absence of ICE legacy. Bob Wilson ps. The source spreadsheet is inside the zip file.
I am working on an Open Office spreadsheet that plots the 'drag HP' as a function of speed and the three roll-down coefficients: There are chart design issues such as using the secondary axis for Standard Units, kph and kW. Just two or possibly four vehicles. And grid lines with major and minor lines. Feel free to offer suggestions. When done, I'll share the spreadsheet in a zip file. Bob Wilson
