Don’t forget to account for the differences in engine and drivetrain efficiency. a gasoline engine gets way less of the gasoline's energy to the wheels. The engines of today are 30-40% efficient iirc, and then you lose more in the tranmission, differentials, etc. Electric motors are ~80-96% efficient and there is less transmission losses involved after that too.
also energy density of cells and packs continues to improve and has improved a lot since 1991
Additionally, electric engines and drive-trains are much lighter. You don't need a gearbox, compressor and many other components. This makes up for some of the extra weight of the battery.
As to the drivetrain losses through transmissions and differentials, I have only my own experience from working on cars, dynos (measuring the power to the wheels), and racing. It depends on drivetrain layout. front engine front wheel drive has fewer losses than front engine rear wheel drive, all wheel drive usually worst of all. You lose another 5-15% depending.
Probably you will also find this video interesting, which goes into depth on the full lifecycle of different fuels and the overall efficiencies:
also energy density of cells and packs continues to improve and has improved a lot since 1991