1\begin{tabular}{lcccccc}2\toprule3& (1) & (2) & (3) & (4) & (5) & (6) \\4& A1 linear & A2 splines & A2t tensor & A3 splines $\times$ powertrain & A4 splines, trim FE & A5 + dealer FE \\5\midrule6Vehicle age (years) & -0.085$^{***}$ & -0.085$^{***}$ & 0.010 & -0.085$^{***}$ & -0.083$^{***}$ & -0.080$^{***}$ \\7 & (0.001) & (0.001) & (0.015) & (0.001) & (0.001) & (0.001) \\8Mileage (10\,000 km) & -0.031$^{***}$ & -0.032$^{***}$ & 0.076 & -0.032$^{***}$ & -0.030$^{***}$ & -0.028$^{***}$ \\9 & (0.000) & (0.000) & (0.442) & (0.000) & (0.001) & (0.000) \\10Battery electric & 0.056$^{***}$ & 0.060$^{***}$ & 0.059$^{***}$ & 0.099$^{***}$ & 0.026 & 0.039$^{***}$ \\11 & (0.011) & (0.011) & (0.011) & (0.023) & (0.019) & (0.014) \\12Hybrid & 0.072$^{***}$ & 0.075$^{***}$ & 0.074$^{***}$ & 0.047$^{***}$ & 0.044$^{***}$ & 0.031$^{***}$ \\13 & (0.008) & (0.008) & (0.008) & (0.013) & (0.011) & (0.010) \\14Plug-in hybrid & 0.106$^{***}$ & 0.118$^{***}$ & 0.117$^{***}$ & 0.135 & 0.031$^{***}$ & 0.033$^{***}$ \\15 & (0.017) & (0.019) & (0.019) & (0.719) & (0.012) & (0.011) \\16Diesel & 0.079$^{***}$ & 0.091$^{***}$ & 0.090$^{***}$ & -0.011 & 0.057$^{***}$ & 0.047$^{***}$ \\17 & (0.010) & (0.009) & (0.009) & (0.014) & (0.015) & (0.013) \\18Manual transmission & -0.034$^{***}$ & -0.023$^{**}$ & -0.023$^{**}$ & -0.023$^{**}$ & -0.060$^{***}$ & -0.055$^{***}$ \\19 & (0.011) & (0.009) & (0.009) & (0.009) & (0.011) & (0.008) \\20Front-wheel drive & -0.029$^{***}$ & -0.024$^{***}$ & -0.024$^{***}$ & -0.024$^{***}$ & -0.018$^{***}$ & -0.024$^{***}$ \\21 & (0.006) & (0.005) & (0.005) & (0.005) & (0.006) & (0.004) \\22Rear-wheel drive & -0.043$^{**}$ & -0.039$^{*}$ & -0.043$^{**}$ & -0.039$^{*}$ & -0.051$^{**}$ & -0.060$^{***}$ \\23 & (0.021) & (0.020) & (0.019) & (0.020) & (0.020) & (0.019) \\24Full-inventory portal & -0.041$^{***}$ & -0.032$^{***}$ & -0.033$^{***}$ & -0.032$^{***}$ & -0.030$^{***}$ & absorbed \\25 & (0.012) & (0.010) & (0.010) & (0.010) & (0.012) & \\26Dealer group & -0.011 & -0.021$^{**}$ & -0.021$^{**}$ & -0.021$^{**}$ & -0.020 & absorbed \\27 & (0.011) & (0.010) & (0.010) & (0.010) & (0.013) & \\28\midrule29Nonlinear age/km terms & no & yes & yes & yes & yes & yes \\30Tensor age $\times$ km & no & no & yes & no & no & no \\31Quality FE & make-model & make-model & make-model & make-model & make-model-trim & make-model-trim \\32Entry-week FE & yes & yes & yes & yes & yes & yes \\33Region dummies & yes & yes & yes & yes & yes & absorbed \\34Dealer FE & no & no & no & no & no & yes \\35Observations & 136\,393 & 136\,393 & 136\,393 & 136\,393 & 136\,393 & 136\,393 \\36$R^2$ & 0.923 & 0.928 & 0.929 & 0.928 & 0.968 & 0.977 \\37Within $R^2$ & 0.836 & 0.846 & 0.848 & 0.847 & 0.801 & 0.777 \\38In-sample RMSE (log) & 0.167 & 0.162 & 0.161 & 0.161 & 0.107 & 0.091 \\39Grouped-dealer CV RMSE & 0.176 & 0.171 & 0.172 & -- & 0.161 & -- \\40\bottomrule41\end{tabular}42