Can we borrow TRON Energy from Free67 on Trust Wallet? Yes, you can only use 3 TRX to borrow Tron Energy to reduce the gas fee of TRC20-USDT transaction. Let ne show you the operation tutorial.
Firstly, I will show my Trust Wallet, and there are 30 TRX and 1 USDT in it. Now I click TRX area to transfer TRX to Free67.

Click [Send]

Input Free67 billing address and the amount. 3 TRX can borrow 32,000 TRON Energy, and you need to transfer 6.1 TRX to borrow 65,000 Tron Energy if the USDT receiver has no USDT. Then click [next step].

Confirm the information.

The Tron Energy will send to your address in 6 seconds afer you transferred TRX to Free67 billing address. You can check the Tron Energy on Tronscan.

Now we transfer USDT, click [Send].

Input the USDT receiver's address, and amount. Then click [next step]

Confirm the information. If the net fee is 13.8816 TRX, we click [confirm].  It will charge only 0.345TRX for the gas fee of bandwidth because we have borrowed 32,000 Energy from Free67. By the way, if the net fee is more than 26 TRX, you need to back to TRX, and transfer 3.1 TRX to free67 billing address. Because it consume 64895 Energy if the USDT receiver has no USDT.

We have finished the USDT transaction, let's go back to the main page. We can see the TRX is 26.655 and USDT is 0.  1 USDT has sent. And the TRX balance is 26.655=30- 3 TRX ( transfer to Free67 to borrow Energy)  -  0.345TRX for the gas fee of bandwidth.

If you are interested in Energy Rental to reduce the gas fee of TRC20-USDT, you can search Free67 from Google.

If you want to check the Energy after you transferred to Free67, you can search Tronscan.