That’s about 2% per hour (1.1W), which is unfortunate to say the least (assuming that drain is linear…,
0.02/h * 55Wh = 1.1W).
However, digging into this a little, it looks highly dependent on configuration, bios, kernel, firmware, etc.
The X1 Nano (also Tigerlake but with an even smaller battery) has a thread on this (English Community-Lenovo Community). OP, is seeing 5% (2.4W) power drain, staff sees 0.8% (0.4W) power drain (the nano has a 48Wh battery).
There’s also a relevant article on Phoronix (Dell Getting Linux Power Management Optimized For Their Latest Systems + Upcoming Tiger Lake Desktop - Phoronix).
So, pulling random ideas out of a hat because I’m way out of my depth here… explicitly powering down USB/networking devices (possibly powering down the SSD?) before suspending may help? At the very least, it looks like there may be room for improvement in software.