Independent vehicle, engine and machinery data

Know the machine before you buy, fix or compare it

Specifications, recalls, fuel costs and comparisons for cars, engines, construction and farm machinery — built from official US government data. Plus 43 free engineering calculators.

Popular:Toyota RAV4Ford F-150Honda CivicExcavatorsTyre size calculatorCar recalls

13,983car model years
9,187recall pages
1,958machinery pages
34,392engine families
43calculators

Explore the database

Car specificationsEngine, fuel economy, dimensions and safety data for every model year.13,983 model yearsRecalls and complaintsNHTSA safety recalls and owner complaints by model year.9,187 pagesCar comparisonsGenuine rivals side by side, with a verdict from the data.485 comparisonsRankingsMost and least efficient, safest and most recalled cars by year.621 rankingsRunning costsWhat a year of fuel costs by vehicle class at today’s prices.MachineryExcavators, loaders, dozers, tractors and more by type and brand.1,958 pagesEngine manufacturersEPA-certified engine families by maker: diesel, marine, motorcycle.34,392 engine familiesMotorcycles, ATVs and UTVsSize classes, makers and recently certified models.Heavy-duty alternative fuelElectric, natural gas and propane trucks and buses compared.CalculatorsEngine, fuel, gearing, towing, hydraulics and cost calculators.43 calculatorsFuel cost calculatorAnnual fuel cost of any car with your own distance and price.

Browse cars by make

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Machinery by type

Backhoe Loaders4 pagesMotor Graders4 pagesSkid Steer Loaders4 pagesTrack Excavators7 pagesTrack Type Tractors5 pagesWheel Loader7 pages

All machinery → · Engine manufacturers →

Most-used calculators

Fuel economy converter and trip costFuel economy is quoted in different ways around the world: litres per 100 km in Europe, miles…Tyre size and comparisonA tyre size such as 225/45R17 encodes the tyre’s width, sidewall height and rim diameter. From…Torque, power and BMEPTorque and power are two views of the same thing: power is torque multiplied by rotational…Power-to-weight and torque-to-weightPower-to-weight ratio says more about how quick a vehicle feels than power alone: a light car…Towing, payload and tongue weightA vehicle has several weight limits, and towing safely means staying inside all of them at…EV charging time and costHow long an electric car takes to charge depends on how much energy it needs, the charger’s…Compression ratioCompression ratio compares the cylinder volume with the piston at the bottom of its stroke to…Machine ownership and operating costKnowing what a machine really costs per working hour is the basis for pricing jobs, deciding…

All 43 calculators →

Popular rankings

Most fuel-efficient SUVs of 2027Most fuel-efficient cars of 2027Most fuel-efficient midsize cars of 2026Most fuel-efficient pickup trucks of 2026Most recalled cars of 2026Least fuel-efficient large cars of 2026Longest-range electric cars of 2027Least fuel-efficient SUVs of 2027

All rankings → · Car comparisons → · Recalls →

Independent

We do not sell vehicles, machinery, parts or insurance, and no manufacturer pays to be listed.

Official sources

Data from NHTSA, the EPA, FuelEconomy.gov, the Alternative Fuels Data Center, Transport Canada and other public bodies.

Free to use

Every page and calculator is free. Always check critical figures against the manufacturer’s documentation.

About PromtEngine

PromtEngine is a reference database for cars, engines and machinery. It brings together specifications, fuel economy, safety ratings and recalls for 13,983 car model years, certification data for 34,392 engine families from the US Environmental Protection Agency, and 1,958 pages on excavators, loaders, tractors and other machinery. You can compare rival cars side by side, see which models use the least fuel or have the most recalls, estimate running costs at current fuel prices, and work through 43 engineering and ownership calculators — from compression ratio and tyre sizes to towing limits and machine cost per hour.