I had a 1999 Triumph Adventurer (with the 885cc engine), I got 51mpg from that with average driving (but no traffic jams). First thing I did, I tossed the stretched oring chain and got a non-oring one which I think helped a fair amount due to the low friction. I added a home-brew chain oiler (total parts cost was about $15 IIRC) which kept the chain looking nice. The bike might have been a bit oily in back but I didn't care.
Keep in mind even if you have to replace a non-oring chain twice as often as an oring one, you are probably still ahead in dollar terms.
Don't worry too much about your fuel cost, just enjoy your SV. You are still getting double the mpgs that everyone else out on that road is getting, maybe more.
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