I am not familiar with the Tohatsu TLDI technology nor the above mentioned motor. I have heard of the Mercury Optimax and the EFI but again am not familiar with them. Then there is the BRP Etec another fuel injected two stroke. I have read a few articles on these engines but not comparisons in technology. I will look into them further as time allows. I know Tohatsu manufactures some of Mercury’s smaller motors and am curious about the 90 TLDI from Tohatsu. Are parts and technology shared or are they separate beast altogether ?