175kt TAS at 10k on 14GPH is not bad for a substantially bigger plane. My best economy cruise at 10k (wide open throttle, 25LOP) is 9.0GPH which gives 140kt TAS which is 1.24 times better MPG. But at 140kt TAS you would be doing better MPG anyway.
Back in 2002 I was comparing data sheet figures and thought the A36 was about 1.5x worse than the TB20. But clearly that was wrong.