CPI Transportation.
Transportation CPI captures everything households spend to get around — new and used vehicles, motor fuel, vehicle insurance, maintenance, public transit, and airfares. It's about 17% of CPI-U and one of the most cyclical categories.
Transportation inflation, year-over-year
FRED:FPCPITOTLZGUSA · U.S. CPI YoY (use widget to switch to category series)
MonthlyWhat CPI transportation measures
Transportation splits into private transportation (~16%) and public transportation (~1%). Private transportation is dominated by vehicles, motor fuel, and the services around them. Public transportation includes airline fares, intercity buses and trains, and urban transit.
Three transportation sub-components have outsized influence on monthly CPI prints: gasoline (volatile), used cars (boom-bust), and motor vehicle insurance (which had an unprecedented 20%+ year-over-year run in 2023–24).
Sub-component breakdown
| Sub-component | Approx. weight | Notes |
|---|---|---|
| New vehicles | ~4% | New cars, light trucks, SUVs |
| Used cars and trucks | ~2.5% | Resale market |
| Motor fuel | ~3.5% | Gasoline (90%+) and other motor fuels |
| Motor vehicle insurance | ~3% | Auto insurance premiums |
| Motor vehicle maintenance and repair | ~1.4% | Parts, labor, body work |
| Vehicle leasing and rentals | ~0.5% | Lease payments and rental cars |
| Airline fares | ~0.6% | Domestic and international air travel |
| Public transit | ~0.4% | Buses, subways, trains, intercity |
Weights are shares of CPI-U, rounded. Exact values vary annually. Source: BLS Relative Importance tables.
What moves transportation inflation
Vehicles are dominated by inventory and incentive dynamics. New car CPI proxies manufacturer-set list prices net of incentives, adjusted for quality (hedonic adjustments handle changes in features). The 2021–22 chip shortage produced the largest new-vehicle CPI increase in modern history. Used cars are even more volatile — they reflect the auction market and Manheim Index moves with about a one-month lag.
Motor fuel tracks gasoline closely; see the energy page for details on the oil-to-pump pass-through.
Motor vehicle insurance has been the surprise of the 2020s. Premiums lag claim costs by 12–24 months because state insurance commissioners must approve rate filings. The post-COVID surge in vehicle prices, repair costs, and medical costs (insurance covers injury claims) all fed into insurance CPI starting in 2022, producing year-over-year increases above 20% — higher than any other major service category.
Airline fares respond to jet fuel, capacity, and demand. Capacity discipline among major carriers since the 2010s has produced more consistent year-over-year increases than the pre-pandemic decade.
How transportation inflation has behaved
Transportation CPI has historically been the second-most volatile category after energy, dominated by motor fuel and used cars. The 2021 used-car shock — driven by the new-car chip shortage forcing buyers into the resale market — pushed used cars more than 40% year-over-year. The 2023–24 motor insurance episode was less spectacular but longer-running, producing one of the largest sustained contributions to core inflation in any single year on record.
Frequently asked questions
How much of transportation CPI is gasoline?
Motor fuel is roughly 3.5% of total CPI and about 20% of transportation. It's the single most volatile transportation sub-component.
Why did used car prices spike in 2021?
A global semiconductor shortage cut new vehicle production by millions of units. Buyers turned to the used market, pushing prices up over 40% year-over-year — an unprecedented move.
Is auto insurance in core CPI?
Yes. Insurance is a service, not a commodity, so it's in core. The 2023–24 insurance surge was a major contributor to sticky core inflation.
How does CPI handle quality changes in new vehicles?
BLS uses hedonic adjustment to separate price changes from quality changes. Added features like airbags, infotainment, or fuel-economy improvements are treated as quality and not as price.
Are airline fares in CPI?
Yes, under public transportation. The weight is small (~0.6%) but volatile, and airfare CPI is closely watched as part of the 'supercore' services basket.
Does CPI include ride-share and taxis?
Ride-share (like Uber and Lyft) was added to CPI in 2018 and is included under intracity transportation services.