Simple rule of thumb for calculating whether gas or electricity is cheaper:
(a / b) ? (c / 4)
a = Gas price per gallon
b = mpg
c = Electricity price per kWh
For example:
$2.50 / 30 ? $0.12 / 4
$0.083 > $0.03
The cost to drive one mile on gas is almost triple the cost to drive one mile on electricity in this example.
Simple rule of thumb for calculating whether gas or electricity is cheaper:
`(a / b) ? (c / 4)`
**a** = Gas price per gallon
**b** = mpg
**c** = Electricity price per kWh
For example:
`$2.50 / 30 ? $0.12 / 4`
`$0.083 > $0.03`
The cost to drive one mile on gas is almost triple the cost to drive one mile on electricity in this example.
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