That "120 mpg" is meaningless. It's a amalgamation of two different things that, logically, do not blend. Your batteries are not changing the efficiency of the gasoline engine, at least ... not how GM is trying to mean. The engine actually only gets about 43 mpg tops. - ThreadSky

anubisthejackal.bsky.social • 299 days ago

That "120 mpg" is meaningless. It's a amalgamation of two different things that, logically, do not blend. Your batteries are not changing the efficiency of the gasoline engine, at least ... not how GM is trying to mean. The engine actually only gets about 43 mpg tops.

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anubisthejackal.bsky.social•299 days ago

To that end, the Honda Insight, which is not that smaller, but probably a lot lighter and purpose built to be a hybrid, gets 50+ mpg. Many other light hybrids can get 50+ mpg.

gteley.bsky.social•299 days ago

It all depends on how much you travel electric only.
I can state I drive 2000 mpg or 20 mpg.
With my mitsubishi I drove 30 mpg on average.
That's my use of the car in my situation.
The Skoda promises 40 mpg on average.
We'll see.

anubisthejackal.bsky.social•299 days ago

Yeah but again: try and tell that to someone - "oh my car gets 120 mpg"

Oh really? It has the world's most efficient ICE ever built, by several orders?

Well, no ... it also has a propulsion battery ...

Ahhhh. So the engine DOES NOT get 120 mpg ...

fvehafric.bsky.social•299 days ago

I'm not measuring the engine, I'm measuring the vehicle. I never said the engine gets 120 mpg. I said the vehicle gets 120 miles per gallon. I'm now done with this stupid discussion.

fvehafric.bsky.social•299 days ago

It's not meaningless. If I drove a conventional hybrid the same number of miles I'd use about 2.5 times as much gas. What's meaningful is how many actual gallons of fossil fuel I pump over the course of the miles I drive.

anubisthejackal.bsky.social•299 days ago

It's meaningless, because again, the propulsion battery is not improving the functionality of the engine, except in a VERY SPECIFIC way when coasting, or accelerating suddenly. Your car is not getting "120 mpg". It's driving on electric sometimes, then using an engine other times.

anubisthejackal.bsky.social•299 days ago

Doing the "combined MPGe" thing is also meaningless, because the efficiency of an electric propulsion system is not measured in "gallons" but kwhs per mile, or similar. And the two systems are different in operation: one uses stored power, the other uses fuel converted to power.

fvehafric.bsky.social•299 days ago

The goal is to use less fossil fuel. PHEVs are better than conventional hybrids at that. Measuring fuel use per miles driven is a perfectly acceptable way to do that. I'm not trying to measure the efficiency of the engine. I'm measuring the efficiency of the vehicle.

anubisthejackal.bsky.social•299 days ago

Also, while a PHEV, in theory, can be more efficient than a conventional hybrid, it actually depends upon user behavior, and if someone buys the car and uses it as a hybrid without ever bothering with charging ... it's now worse than some ICE-only cars.

anubisthejackal.bsky.social•299 days ago

Yeah, which is ... also somewhat meaningless.

The number is also meaningless because you could drive the Volt without ever using the engine. In which case it gets ... infinity miles per gallon? Null result illogical miles per gallon? Oh wait, then you'd have to switch to kwh per mile.

fvehafric.bsky.social•299 days ago

And the fewer long distance trips you make, the better PHEVs look in comparison to conventional hybrids. It's not close.

anubisthejackal.bsky.social•299 days ago

Yeah, except ... you're now driving an electric car with a very heavy engine strapped onto it, plus exhaust system, plus fuel tank, plus hardware to mesh the two systems. This also makes the car insanely complicated and expensive to service. If you want a simple BEV errand car, get a Nissan Leaf.

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