That's actually excellent mpg. The inside looks like a lovely place to be as well. Must get a test drive and take it from there. Are they an 8 speed box? Tax is the only downside to them from what I can see so far.List price of mine was well north of £40k (infact it was nearly £50k when new) so yeah, £450 a year to tax. All the E Class coupes are over £40k new I believe.
MPG wise I usually get high 40s to low 50s though I have seen upto mid 60s!