Without your actual retail-delivered electricity and gas rates it's hard to say how much more the electric tank will cost to run, but unless you have 5 cent electricity or $2/therm gas it's definitely less expensive to heat hot water with gas than electricity.
At a buck a therm gas (typical US average- yours could be more), in a hot water heater with an EF rating of 0.60 (not the highest, not the lowest) for every buck of fuel you get (100,000BTU/therm x 0.6=) 60,000 BTUs of heat into the water (more or less- depends on how much water you use), which is 1.67 cents/1000BTUs.
At 12 cent/kwh electricity (about the nat'l average), in a tank with a 0.90 EF rating (not the highest, by any means) every kwn delivers (0.9 x 3412=) 3071 BTUs to the water for 12 cents, which is 3.9 cents for every 1000BTU. That's 2.3x the cost of heating it with buck-a-therm gas in a standard gas HW heater.
If you replace the gas HW heater with a ~0.90 EF condensing version like a
Vertex, with $1/therm gas you'd be at 1.1 cents/1000 BTU of water heating. If the gas lines to the existing tank are big enough to handle a 76,000BTU/hr burner (probably true, unless it's a very long run from the regulator), the installed cost of installing a Vertex would likely come in at about the same as the electric tank heater that would need the extra electrical work. There may be state and utility subsidies available for going with a condensing tank heater too, which could make it even cheaper.
32 gallons/day of hot water would be on the low end of usage for 2 adults, but not impossible if you only take short showers, and have EnergyStar clothes & dishwashers, etc. At 32 gallons /day use the EF of an atmospherically drafted gas water heater falls off by quite a bit (they're tested at roughly twice that daily volume), but not as much for an electric tank or a condensing gas-fired tank.
IIRC you can't even BUY appliances that have continuously burning standing pilots in California (and many other states) these days, most have an electronic ignition, even though the electronic ignition only strikes a (temporarily burning) standing-pilot that lights the main burner.