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Table 4 Summary statistics—multiple regression analysis of certified and real-word energy consumption of passenger cars as a function of vehicle attributes; significance at 1% level (***), 5% level (**), and 10% level (*)

From: Energy efficiency trade-offs in small to large electric vehicles

Energy consumptionCoefficientValueStandard errort valuePr (> abs t)p valueAdjusted R2
 Model 3: energy consumption = α3+ β3mass + β4power + β5year
Certified(Intercept)1131011.120.27< 0.0010.43
Mass***6.40e−038.65e−047.404.00e−12
Power− 4.02e−032.80e−03− 1.430.15
Year− 5.33e−025.02e−02− 1.060.29
Real-world(Intercept)**2681122.391.81e−02< 0.0010.47
Mass***5.89e−039.14e−046.451.08e−09
Power3.87e−032.81e−031.380.17
Year**− 0.135.58e−02− 2.322.18e−02
 Model 6: log(energy consumption) = α6+ β9log(mass) + β10log(power) + β11year
log(Certified)(Intercept)4.156.700.620.54< 0.0010.45
log(Mass)***0.608.00e−027.472.69e−12
log(Power)− 3.99e−032.94e−02− 0.140.89
Year− 2.88e−033.24e−03− 0.890.37
log(Real-world)(Intercept)**1972.571.10e−02< 0.0010.47
log(Mass)***0.467.78e−025.971.33e−08
log(Power)***5.92e−022.27e−022.619.90e−03
Year***− 9.97e−033.65e−03− 2.737.02e−03