Just a quick question, does the 300mpg relate to the amout of miles it has done and how much fuel it has used, only?
What i mean does it take into account how many kwh's have been used from plugged in charging?
What do these cars actually cost per mile with the fuel cost and electric cost combined, on a commute like yours?
Great question, and one I'd never found the answer to before getting the car!
I don't think the TFSIe uses '2 Cylinder mode' but more like '0 cylinder mode' as it coasts a lot, where the ICE is switched off and disconnected from the transmission by one of the 3 clutches. The power gauge sits at zero on even the smallest of downhill gradients.
The 300MPG is like a start figure for the ICE engine. If the ICE engine runs it goes down from there. Otherwise, if doing all EV driving, it stays at 300.
In 'Hybrid mode',' it's a little more convoluted, the ICE figure AND the EV figure of Miles/kWH apply equally to the total mileage.
Here's my commute home today in Hybrid mode for example (BP Pulse chargers at work still borked!).. ignore the battery gauge as this photo was taken after a recharge.
Some back of an envelope calculations below. Let me know if I've goofed up anywhere..
So, a 35.6 mile journey, I used electricity at a rate of 9 miles per KWh, so 35.6/9 = just under 4 kwh. At todays domestic price cap of 35p that would be 1.40s worth of electricity
I also used Petrol at 119 mpg so 35.6/119 = roughly 0.3 gallons which, at todays ludicrous £1.84 per litre (£8.35/gal), works out at £2.50
In total, a journey cost of £2.50 + £1.40 = £3.90 or
10.8p per mile in 'Hybrid' Mode
This figure would obviously creep up the longer the drive as the battery energy would have to be spread further, until ultimately I guess, the cost would increase to not far from that in ICE mode (I've yet to make any such journey)
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In my 'EV only' drive in my first post above, 4.9 m/kWh means I used 35.4/4.9 = 7.32 Kwh, costing at the rate above,
£2.56 In EV mode (7.2p/Mile)
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In the ICE mode drive above, at 58.6 mpg, I used 38.1/58.6 = 0.65 Gallons,
£5.42 in ICE Only Mode (14.2p/mile). plus a little bit of battery equating to less than an additional penny per mile.
It concludes here that even using peak rate home electricity at the current price cap of 35p/kWh, EV driving the TFSIe is half the price of petrol on that sort of journey. Anyone who has solar or a cheap rate overnight tarriff slashes that to as much as zero.
It also, using these figures, doesn't take much to see where the public charging companies will push up their tarriffs to make EV driving only just a little bit cheaper than ICE. ..this is mainly for fast charge rates that are anyway of no use to the TFSIe
Whether this fully justifies the extra cost of the TFSIe over a 'conventional' A3, who can say, but the way fuel prices are going, that's a moveable feast! I personally, love the tech!
I wonder how much the folly of 'Self Driving Hybrids work out per mile??!