What size are your tyres ? The 16" Honda wheels with 185/55R16 tyres are not made for comfort
, I have just fitted 175/65R15 tyres and wheels to her indoors Mk2 (the ride was so much better with 175/65R15 winter tyres and steel wheels that she wanted 15" wheels on all year round).
If tyres are under-inflated the edges will wear before centre of tyre and MPG will be worse, and if over-inflated centre will wear before edges. My TPMS squawked at me the other day because one of my front tyres was about 3 psi over-inflated.
The stick gauges are normally reasonably accurate in my experience (if they have been looked after and are not full of dirt from rolling around in a car boot) so I would trust them over a inexpensive dial gauge, and digital gauges can give 'an illusion of accuracy' because there is a nice number to look at, my Michelin footpump dial gauge is also pretty accurate - I would trust the reading of 3 out of 4 devices as they seem to match up fairly well as they are all reading lower than the one dial gauge. Garage forecourt gauges are a bit hit and miss - if I ever use one I always check pressure afterwards with a stick gauge. Radial tyres always look a bit bulgy and soft due to supple sidewalls.
General advice is fill your tyre at a service station and then check it with all your gauges, if any of your gauges agrees with the service station pressure then you should bin it.