Please check my approch

[anksm22]

Domestic automobile manufacturers have invested millions of dollars into research to develop cars more gasoline-efficient even than presently on the road.

(A) into research to develop cars more gasoline-efficient even than presently on the road
(B) into research for developing even more gasoline-efficient cars on the road than at present
(C) for research for cars to be developed that are more gasoline-efficient even than presently on the road
(D) in research to develop cars even more gasoline-efficient than those at present on the road
(E) in research for developing cars that are even more gasoline-efficient than presently on the road




the idiom is more X than Y.
and only D uses it correctly---> cars more gasoline-efficient than cars present on the road

[MartyMurray]

Domestic automobile manufacturers have invested millions of dollars into research to develop cars more gasoline-efficient even than presently on the road.

(A) into research to develop cars more gasoline-efficient even than presently on the road
(B) into research for developing even more gasoline-efficient cars on the road than at present
(C) for research for cars to be developed that are more gasoline-efficient even than presently on the road
(D) in research to develop cars even more gasoline-efficient than those at present on the road
(E) in research for developing cars that are even more gasoline-efficient than presently on the road




the idiom is more X than Y.
and only D uses it correctly---> cars more gasoline-efficient than cars present on the road

Yes, you got it, and explained it well.

The others compare cars with something else or gasoline-efficiently with something that comparing it to does not make sense, such as presently, as in more gasoline-efficient even than presently.