If car of mass m=1000 kg I want to accelerate to speed v=50 m/s then to me need to calculate friction of car axis on which puted wheels and friction of wheels into ground and air friction. So I suggesting such formula m*a*t+k*m*a*S+c*m*a*S=m*a*t+k*0.5*m*v^2+0.5*c*m*v^2, where a is acceleration of car say a=10 m/s/s and S is distance which car made until got speed v=50 m/s and k is friction koeficient of car wheels inside car and to the ground and c is koeficient for air friction. I would give k=0.01 and c=0.0001 and t is 5 seconds. So total energy of car: m*a*t+k*0.5*m*v^2+0.5*c*m*v^2= 1000*10*5+0.01*0.5*1000*50*50+0.0001*0.5*1000*50*50= 50000+12500+125= 62625 J. If you can calculate better just calculate and show and don't blame my formula.