I do get your concerns, in fact, that is why I ask. Looking at the fact that I am researching this one (getting wings) to death since about 3 years just makes it clear to me that what I really want does probably not exist within my budget. (800 NM range, 120-130 KTAS @ > 8 GPH) and that I will need to compromise or desist.
They do exist, but very rare. I have a Cessna Hawk XP which does exactly what you require. Full IFR, constant speed prop 210hp and 32lph at 128kts and and an 18.5k service ceiling (I have had it higher when needed).
Unfortunately there are not many around and rarely seen for sale. The predecessor was the Reims Rocket, does the same thing but a little older and I have seen a couple kicking around for sale in GA Buyer.