With your pods/pipe, correctly jetted, you can expect around mid-thirties city and 40+ on longer trips.
You could still have other issues, especially a combination of issues, but with the info provided so far, I'd suspect the carbs. But like I said, the electrical has to be checked out as you're doing. No sense trying to re-jet with a poor/weak spark or incorrect timing.
As for the carbs, you have no way of knowing what someone may have done to them. The floats could be way off, incorrect jet needle position, incorrect needle jet, worn jet needle(s), dirty carbs...
I'm focusing on the pilot and needle circuits because I'm assuming your recent riding is basically just cruising around town and that would definitely be the pilot/needle circuits.
I don't know your knowledge of taking carbs apart, but if you look up my past posts I'm sure you can get the info to work on them yourself. There's also a new VM carb section that's can help you do the work. I'm just not sure your mechanic is familiar with these carbs to do a good job. Like I said, if you're missing the jet needle spacers or they were re-installed wrong, your mileage would be terrible. Just one of many possibilities. If the mechanic isn't familiar with these carbs, you could go on forever without fixing them.
Taking them apart to inspect the needles is mandatory. Since they'll be apart, clean them out and order the VM o-ring kit (cheap) from Robert Barr, a member here. Also order manifold o-rings and check manifolds. Adjust the floats...all this stuff. Verify the side air screws and pilot fuel screw operate right, etc. Do all this, ask questions and we can re-jet some carbs that we know are ready to re-jet.
This may sound like a pain, but this is the best/quickest way to get the bike going good again and being a nice bike to ride around. Just takes a little cash and some work. If you don't wish to buy a carb tool ($40) and learn to vacuum synch (easy), then I hope the mechanic can do a good job. Vacuum synching is important to the re-jet and performance and getting accurate plug reads. Vacuum synching must be done after disturbing the jet needles/slides.
I'm just passing on my experience and hoping you're providing correct info to help us troubleshoot your problem. Don't take short cuts. If the rest of the bike is in a decent tune condition, rebuild the carbs and save yourself frustration.
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