I’d ignore my range figures @kezo As mentioned previously, petrol range is based on fuel remaining divided by the most recent economy. I’ve only driven 150 miles so far. Most of that was in EV mode, and the tiny bit in petrol wouldn’t have been terribly economical as some of the petrol was being used to charge the battery (HEV mode). Your figures will be far more accurate as you have driven much further, a lot of which has been using the engine, so the computer will be basing your range on more factual driving history. I’d expect mine to get closer to yours over time. Your range is assuming around 52 mpg. However, as we know, mpg is overstated by the cars computer due to the miles travelled in EV mode still being counted within the calculation.
I’m not going to attempt any new cost calculations until I refuel, as there’s an element of guesstimation in it due to the above issues. However, if I do journeys in EV only, I know that each 1% of battery usage costs me 3p (a 15-100% charge costs me £2.60). Taking yesterday as an example, I drove 25 miles and the battery dropped from 100% to 23%, so I used 67%. 3p x 67 = £2.01. This cost divided by 25 miles = 8p per mile. Where I live petrol is now £1.389 per litre, which is £6.31 per gallon. If you divide the 8p into £6.31 that gives an equivalent ICE mpg economy of 79 mpg. Yesterday I had a stop and also had the car up to 85 mph, all in EV mode, so my economy wasn’t as good. I’m sure I’ve had runs at about 6p per mile, or even slightly less, which would be an ICE mpg equivalent of over 100mpg.
The way I’m going to do my cost calculations is as follows;
1) Record all charging costs. I’m logging them all as 3p per % below 100% when I plug them in, so if I plug in and the battery is at 50% then the cost to charge that time is £1.50. In total I’m up to around £6 in charges so far, but it will be around double that by the time I refuel with petrol at the end of next week.
2) When I fill up with petrol, add the £ cost of the petrol to the £ cost of all the charges made since the car was last refuelled
3) Divide this total cost by the miles driven since the car was last refuelled, to get a total pence per mile running costs
4) Divide the resultant pence per mile into the current £ price of a gallon of petrol in order to get an ICE mpg equivalent. This stage isn’t really necessary as the pence per mile is the most relevant, but as a PHEV requires charging after each use, whereas an ICE car doesn’t have to be touched between refuels, I just want to satisfy myself that the faff of having to charge is worth it 😂
The widely respected Harry at Harry’s Garage does this same calculation when looking at charging costs of BEVs, as referenced in this video