Is it possible to make 8% more over 10 years if one is investing in MF direct plans in lieu of regular plans

It is absolutely not possible to say with certainty that you can earn 8% more from direct plans compared to regular plans if you remain invested for 10 years. Direct plans have been launched in the recent past and we have seen some differential in returns between regular and direct plans. But it is too early to say that the difference between two plans would be as high as 8% as mentioned by you.

There are pros and cons of investing between the two plans and if you could go through the following articles it may help you understand the difference –

https://www.advisorkhoj.com/articles/Personal-Finance/Should-you-invest-in-Mutual-Funds-through-a-Financial-Adviser-or-through-Direct-Plans

https://www.advisorkhoj.com/articles/Personal-Finance/Should-you-go-for-mutual-fund-direct-plans

Hope the above helps.