Aha, something I can get into! I'm not as into my buses as I used to be, as the scene's changed too much. When I first started taking a proper interest, First Cymru was overflowing with step entrance Darts. Proper beasty ones, and you've not had a proper Dart bash unless you've been up Mount Pleasant Hill or Middle Road in either direction in Swansea. Good, awesome times and I only wish I'd made an effort to capture the delights of such things on tape when I was living down there and commuting on them regularly. Same for noting moves properly and making more effort with video/photography on the buses when I used to very regularly travel to/from Hendrefoilan Student Village. Many Marshall-bodied Darts plenty of step entrance Darts on routes 8/9/8A/9A, even got the occasional Olympian in (34804 comes to mind, need to find my 2004 First Bus Handbook to see what I got on once) and on a Sunday morning a Mini-Merc on what I think was route 37A or similar. Damn it, I'm getting flooded with memories now...Wonder what they use up there these days, probably nothing interesting.
Anyway, back in reality, I commute 5 days a week to work and accumulate plenty of mileage doing so. I've lost a lot of my moves when I lost my 2011 moves book, fortunately I'd noted the mileages per vehicle down before then on a scrap of paper so carried on from those totals. They were lower than what I knew I had been on, so there's been no fudging before you think it! These days, instead of travelling on Darts of proper beasty noise (going up Middle Road on a SLF Dart is just no fun, and I know so from having done route 111 all the way from Swansea to Llanelli some time ago), my usual moves see me on a Mercedes-engined MCV Evolution and one of three different Optare Solos. Since you're all so keen to know what my figures are:
YJ05 WCW (Optare Tempo, my old regular vehicle before the MCV): 3,132.2
YE52 FHA (Optare Solo): 1,363.7
Y876 PWT (Optare Solo): 605.2
Y877 PWT (Optare Solo, the one that turns up for me most often): 1,127.6
YJ59 GFZ (Optare Solo, never turns up now on my move home): 131.6
YJ58 CFG (Optare Tempo): 282.5
VA51 SAR (Optare Spectra): 569.3
W408 UCJ (Optare Excel 2, an absolute monster): 317.9
VX12 FBO (MCV Evolution, my current regular move to work): 665.1
All mileage since 23rd March 2011.
As for route numbers bashed, can we count ones done in Eire too? If so, I've been on Dublin Bus' 16A and 41 over there, no idea what route numbers I've done on Bus Eireann now (Dublin to Rosslare and Wexford to Waterford). On these shores, I have honestly lost track of what routes I've done all in all, so this list is very far from exhaustive. You know that I'll be doing more bus routes on purpose to add to this list now don't you Ivo!

So we go:
8, 9, 8A, 9A, 14, 31, 32, 33, 49, 51, X53, 55, 66 (Swindon to Oxford, how'd I forget that one!), 70 (Swindon to Andover, can't think what it's numbered beyond Marlborough at the mo) 72, 75, 78, X94, 94, 97, 100 (Cardiff to Swansea Shuttle IIRC), 104 (was before Hereford City Council renumbered the bus routes and changed everything around some years ago, 2003/2004), 110, 111, 112, 151, 234, 265, 266, 416 (Hereford to Monmouth, now Stagecoach has it as 36), 461, 462
Can't remember the rest right now. Might have done 33 in Swansea years ago, vaguely remember doing a 6 there too but difficult to be sure. Wish I had a more accurate list now, definitely going to start such a log now. More there than I originally thought there would be, more kept coming to mind as I went along. Shocked I'd forgot about the 66, heart-of-wessex will no doubt remember how much we hated that! I even had to Google the 49 from Trowbridge to Swindon, that was embarassing...