New car registrations in January-July, at 64,138, were up 18.7% compared to the corresponding seven-month period of 2016.
Sales of heavy commercial vehicles rose 8.5% to 3,229 in the first seven months of this year.
Motorcycle registrations climbed 28.8% to 285 in July, but rose just 3.6% to 1,649 in the first seven months of 2017.
Sales of heavy trailers rose 15.2% to 341 in July, and were up 15.8% at 2,342 in the first seven months.
Sales of light commercial vehicles fell 12% to 1,399 in July, and were down 12.4% at 10,265 in January-July.
Bus registrations amounted to 22 for the month, up 66.7%, and to 308 in the first seven months, an increase of 28.3%.
The MGE said it expects new car registrations to exceed 100,000 this year.