Practical guides for drivers
Understand what the figures mean, which assumptions matter and how to make a sound comparison.
How to Calculate Fuel Cost for a Trip
Calculate trip fuel cost from distance, MPG or L/100km and pump price. See a worked example, unit checks and practical ways to budget for traffic and detours.
What Is Good MPG?
Learn what counts as good MPG for different vehicle types, how to compare US and UK figures, and how to measure real fuel economy from your own fill-ups.
MPG vs KM/L Explained
Convert MPG to km/L without mixing US and Imperial gallons. Includes exact factors, a worked example, inverse L/100km checks and common conversion errors.
How Fuel Economy Is Calculated
Work out real fuel economy from odometer readings and fill-up litres or gallons. Learn the formulas, a full-tank example and ways to reduce measurement error.
How to Read a Tyre Size
Decode tyre markings such as 225/45R17 with a clear calculation for sidewall height and diameter, plus load, speed-rating and fitment checks. Use the figures a
What Does 225/45R17 Mean?
Calculate the nominal diameter and circumference of a 225/45R17 tyre, understand each marking and see how a profile change affects speed and clearance.
How Car Loan Interest Works
Understand car-loan amortisation with a $24,000 worked example, monthly interest breakdown, APR checks and practical ways to compare finance offers. Compare a
How Much Car Can You Afford?
Find a sensible car budget by including fuel, insurance, maintenance, tax and parking—not just the advertised monthly payment. Keep the original units beside y
How EV Charging Cost Is Calculated
Calculate EV charging cost from energy added, charging losses, tariff and session fees with a 54 kWh worked example. Keep the original units beside your result
How Long Does an EV Take to Charge?
Estimate EV charging time from energy added and charger power, with a 40 kWh example and practical limits such as tapering and temperature. The worked numbers
What Is Power-to-Weight Ratio?
Calculate power-to-weight ratio in hp/tonne or kW/tonne, with a 200 hp example and the practical limits of using the figure to compare cars. Use the figures as
Horsepower vs Kilowatts
Convert horsepower to kilowatts correctly by distinguishing mechanical hp from PS, with a 200 hp calculation and advice on power ratings. The worked numbers ar
PSI vs Bar for Tyre Pressure
Convert tyre pressure between PSI, bar and kPa with a 35 PSI example, while explaining cold readings and why sidewall pressure is not the target. The worked nu
How Car Depreciation Works
Estimate car depreciation with a compounding 15% example, then adjust for mileage, condition, service history and local resale demand. Compare a second scenari
How to Estimate Annual Car Running Costs
Estimate annual car running costs by combining fuel, insurance, tax, repairs, tyres, parking and depreciation with a worked budget example. Keep the original u
US MPG vs UK MPG
Understand US versus UK MPG, convert a 30 MPG example correctly and see why L/100km can make international fuel comparisons easier. Use the figures as a planni
Miles vs Kilometers
Convert miles and kilometres accurately for road trips, fuel budgets and dashboard readings, with exact factors and a 60-mile example. Compare a second scenari
Understanding Engine Displacement
Learn how engine displacement comes from bore, stroke and cylinder count, with a 1,998 cc example and the limits of using capacity to predict power. The worked
What Does Engine CC Mean?
What does engine CC mean? See how cubic centimetres become litre labels, follow a 1,498 cc example and separate capacity from horsepower. Use the figures as a
How to Estimate Road Trip Costs
Plan a complete road-trip budget with fuel, charging, tolls, parking, lodging, food and contingency using a clear $341 example. Use the figures as a planning a