Maybe the gas symbol should be required by law.
When I sold appliances for Sears, it used to amaze me how many potential customers had NO IDEA if their dryer was gas or electric.
To save the $50 exra a gas dryer costs, many wanted an electric one with no concept that operitng costs (in my area) weoudl triple, and that they are not plug-and-play, and need a dedicated heavy-duty 220 line.
Even stranger if shoppers did not know what their stove/cooker utilzes as an energy source.
P.S. perhaps there should be a $150 tax on electric dryers so that they end up costing $100 more than the gas ones. This will encourage users/builders to go after the gas ones which tend to be greener unless one's electric is sourced from hydroelectric or solar.