New 2022 PP owner

Whenever the Prime is using the ICE, it's practically the same vehicle as the Prius Hybrid, and 54 MPG is a good number. 100 MPG is misleading. It's really MPGe, with the 'e' being the key factor--they're counting EV driving in that number. Also, don't simply use the figure reported by the car, take your miles driven from the odometer and divide it my the gallons you put in the tank to arrive at your actual MPG. Plus you also need to figure in the cost of KWh you're using to arrive at your total vehicle cost per mile.

 

Welcome. Don't depair, even car salesman latch on to the EPA rated 133 MPGe and advertise 133 miles per gallon. MPGe (electric) and miles per gallon (gas) are two different measurements. The Prius Prime is EPA rated at 54 miles per gallon.

If one only used gas they'd get 54 miles per gallon. If only using electric they'd get infinite miles per gallon. The folks saying they are getting 100 miles per gallon are stating the average miles per gallon combining both electric and gas usage. Here's short video explaining MPGe.

 

If you are not charging, then what you are driving is a pure Hybrid Prius. It is probably not very likely you can get 100 mpg on a gas engine alone. Although I have seen a few hyper-milers reporting 70 or even 80 mpg. My lifetime average Hybrid-only mpg was 55mpg.

 

Yes, not being able to charge makes your Prime more like a regular Prius, so 50-60 mpg generally. With my charging at home and work, averaging 280 mph over the past 30,000 miles.

When on longer trips out of EV power and at highway speeds, but gently feathering the throttle, slow accelerations, and timing the stops at lights typically getting high 50’s to low 60’s mpg unless in the mountains then mid 50’s.

 

That's a good vid about mpg calculation.