edatoakrun wrote: GRA wrote:
However, for the PHEV-to-PHEV comparison, I think you need to also consider ICE mpg, as of course both the Prime and Ioniq PHEV will have very short E range, and neither have DC charge capability, meaning both will need to burn a lot of gas, as driven by most of their owners.
That assumes that most owners won't chose a PHEV with an AER that matches their routine daily requirements...
No, it does not.
assume that most owners often drive beyond those short routine daily requirements
If the owner of a ~ 6kWh available PHEV like the Prime has a routine daily requirement
~20 mile commute, and they have total driving needs of ~12,000 miles per year, the majority of those miles will probably be fueled by gasoline.
Uh huh, and for those miles driven on gas well beyond the AER, most of which will be Hwy miles (I'm assuming that owners will use hold mode to maximize the AER and the ICE efficiencies), you want the highest possible mpg. The Prime gets 53 mpg Hwy, while the Volt gets 42 mpg Hwy. So, which one will use less gas over the course of the year depends on how much of your non-routine driving falls into the range between the AER and the crossover point for the car with less AER but superior Hwy mileage. If you do a lot of intra-regional driving but not much inter-regional or longer driving, the car with higher AER may use less gas; exactly the opposite is true if the majority of your non-routine driving is inter-regional or longer.
For example, if your non-routine driving is typically 100 miles between charging/refueling, then in the Prime you'd drive 25 miles on the battery, and 75 miles on gas, using about 1.4 gallons. In the Volt you'd drive 53 miles on the battery and 47 miles on gas, using about 1.1 gallons. Advantage Volt.
What if you drive 160 miles, as above? Prime, 25 miles battery + (135/53) = approx. 2.55 gallons. Volt, 53 miles battery + (107/42) = approx. 2.55 gallons. At any refueling/recharging distance beyond 160 miles, Advantage Prime. My typical road trip is 400 miles or more, often un-refueled and with nowhere to charge, so there's no question that given my mix of non-routine driving (actually, for me the road trips ARE my routine driving, but that's an outlier) the car with smaller AER but higher mpg will use less gas. People with other mixes will have their own best option.
edatoakrun wrote:It's not a bad thing to drive a car that burns less gas such as a PHEV, but it is obviously a better idea to drive a car that burns no gasoline for as many of your total vehicle miles as is practical.
For the vast majority of drivers today, the superior option is a BEV.
That's a value judgement based on your priorities and circumstances, rather than an objective measure. Not that there is one, since everyone will make judgements based on their own priorities and circumstances.