GE 30" 5.0 cu. ft. Free Standing Gas Range (Stainless Steel) Expired

Natural gas provides significantly more therm BTUs for the same price.
Also, much like furnaces, gas stoves also vary in the efficiency that they burn the gas between models so it is difficult to actually give a x decimal number for efficiency for gas stoves in general.
In terms of energy-used to energy-wasted, gas stoves are actually pretty wasteful, because not all of the fuel is actually burned. Mid-range furnaces only burn and transfer about 80%+ of the heat that they generate. High efficiency furnaces can be up to 98%. I can't even guess what the actual percent of fuel burn efficiency for gas stoves might be, but it isn't going to be anywhere near 90% for the average stove.

But the thing is, even with the poor efficiency comparative to electric, even with recent rate hikes it's still cheaper to use gas.

The unvented and unburned fuel being released into the interior of your home as combustion components and byproducts is what a lot of groups are complaining about. If you get a gas oven already you really really do need to have a vent above the stove and also open the nearest window a small crack so that you get fresh oxygen into the kitchen and provide free air flow for the stove vent to function. If you can smell the gas stove burning smell from across the kitchen, or worse from another room, then you really don't have anywhere near adequate ventilation. Install / turn on your stove vent and open that window!

Gas stoves can provide instant, intense, sustained heat, and so get up the temperature and cook food much faster. Example, boiling a large pot of water for pasta. Even on a medium setting a gas stove will have tap water boiling in about a third of the time of an electric stove.

Electric stoves, in terms of energy efficiency, are about 98 to 99% efficient but take a significant amount of time to warm up, let alone actually transfer that heat to whatever you're cooking. In the boiling water scenario people with gas stoves will probably already be eating before the electric stove has even finished cooking the pasta.

Electric stoves are cheaper to buy but end up costing much more long term because they are expensive to run, they take longer to cook food, but on the plus side don't require anything more than a electrical hookup to operate. (Although having an range hood is still a really good idea to get out excess heat and moisture) Electric stoves have never killed anybody with carbon monoxide or asphyxiated them because it burnt all of the oxygen in a home without proper ventilation.

Gas stoves are more expensive to buy but the cost is offset over time because they are cheaper to use, cook significantly faster, are more versatile to use, are more reliable because they don't require electricity to run during blackouts, but need ventilation.

It comes down to what 'efficiency' means to you, saving yourself time or money in the short term. If you're only going to live in a place for 6 months and need a new stove, an electric stove is a great option (compared to just using a hot plate or toaster oven.)

If you're looking at the long-term, then a gas stove absolutely blows electric stoves out of the water in terms of both cost and functionality, but absolutely need to have proper ventilation imo.

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They can ban the sales but good luck banning use, especially in rural areas where every house has their own LP tanks for supply.
Electricity grids are already overloaded and shutdown during major weather events for public safety (pg&e), so requiring more electric demand with applicances wont happen

Electric stoves are garbage. I love gas stove with my round bottom wok.