An Imperial gallon is still 4 qts (hence the name), but the UK quarts are a little bigger than US quarts. 1 Imp gal is approximately 1.2 US gal. The discrepancy comes from the fact that many different gallons were in use at the time when the US and UK independently standardized units of measure.jadnashuanh wrote: ↑Sun Dec 29, 2019 10:59 pmIf you're using a British gallon (5 qts) versus a US gallon (4 qts), then 30mpg is pretty poor. Otherwise, it's on par with what I've heard from other people. If you can't recharge, and are running a long trip almost entirely on petrol, there are LOTS of other vehicles that are more efficient. The car only excels when it's not needing the REx to run. The REx was introduced as an aid to help people overcome range anxiety. That people use it to extend trips longer than it was designed for is sort of a tribute to the design flexibility. Used as an emergency, get home without needing to call for help, it can provide peace of mind. Don't expect it to be that efficient.
For my 2018 i3S REX found the following infojadnashuanh wrote: ↑Thu Jan 02, 2020 6:31 pmEPA seems to rate the REx at 31mpg. A stationary engine can be more efficient than a more normal ICE used in a vehicle, as running at ideal speeds is better than moving around, connected to a transmission with speed variations. You have two issues, thermal efficiency, which isn't great on most any ICE, and then, the conversion of that rotary power into electrons that can propel the vehicle. That efficiency is much higher than an ICE to moving the vehicle directly. But, to keep propelling the i3 at high velocity or load, is pitting a puny engine up to a very large task. It works running around town, often without any limitations, but try to run at high speeds or loads for longer periods of time, and it's not at its best use (moving a moped, which, tends to not weigh much, or go as fast!).