What "suburban family gas spend" actually looks like
Two cars, 12,000 miles/year each at 25 mpg = ~960 gallons of gas. At $3.50/gallon that's $3,360/yr — or $280/month. Some households (long commutes, larger vehicles) push past $400/mo. Either way, gas is rarely a household's #1 spend category, but it's reliably top-five.
The cards that do well on gas tend to do well on groceries and dining too — gas-specific cards exist (Costco Anywhere Visa, ExxonMobil) but they're rarely the right standalone answer for a family. The dominant pattern is a multi-category 6%/3%/3% card (Blue Cash Preferred) that happens to include gas, rather than a single-category gas card.
EV considerations
If you drive an EV and charge mostly at home, your "gas" spend shifts to electricity — which earns no bonus on any major card, and is usually paid via ACH anyway. Public charging (EVgo, ChargePoint, Electrify America) typically codes as "utilities" or "gas stations" depending on the merchant, with no consistency across networks. EV households should optimize for grocery and dining categories instead, where the spend actually exists.