Most fuel-saving advice boils down to two categories: drive less or drive smarter. For households that can't just drive less, a handful of changes can realistically cut weekly fuel costs by 10–20%.
Under-inflated tires increase rolling resistance. Every 1 PSI below spec can cost roughly 0.2% in fuel economy. Check monthly; it's free.
Aggressive driving on highways can lower fuel economy by 15–30%, and by 10–40% in city traffic. Cruise control on flat highways helps.
Every 100 lbs of extra weight costs about 1% in efficiency. Empty the trunk and remove roof racks you're not using.
Below about 40 mph, roll the windows down. Above that, A/C uses less fuel than the drag from open windows.
A clogged air filter, fouled spark plugs, or a dragging brake caliper can each cost 5–10% in fuel economy before you notice any driveability issue.
Modern ECUs are calibrated conservatively for worst-case conditions. Under normal driving, OBD2 fuel-optimization chips can trim an additional 10–15% by matching injection timing to your actual commute.
Calculate Your Personal Fuel Savings →A combination of higher state taxes, the state's unique CARB-approved fuel blend, fewer refineries serving the state, and the distance fuel has to travel from other production hubs. Together, those factors typically add $1.50–$2.00 per gallon compared to Gulf Coast states.
Mostly, yes. The gap between regular and premium is typically 50–80¢ per gallon and stays fairly stable. Both rise and fall with crude oil prices, but premium margins are slightly less sensitive.
Historically, late fall and early winter (October through January). Demand drops after summer travel and refiners switch to the cheaper-to-produce "winter-blend" gasoline.
Not significantly for fuel economy. All retailers in the US meet the same federal minimum detergent standards. Top-tier brands include slightly more detergent additives, which can matter for long-term engine cleanliness but won't change your MPG.
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Data last refreshed (most recent EIA release).