Haha. Very funny Mr. CFI.
The last time I flew a decent XC I was coming back out of Llano. I'd swung north to let my passenger take some pics over Buchanan Lake, and then turned back SE. Center handed me off to Approach about 30 mi out.
Me: "Approach, Skyhawk 12345 level four thousand five hundred."
Approach: "Skyhawk 12345, say position."
Me: "Approach, Skyhawk 12345 is approximately 30 miles northwest of the airport."
Approach: "Skyhawk 12345, radar contact, showing you TWENTY-EIGHT miles northwest."
So I give them exact readings off the GPS now.