Jeep Repair: Multiple problems, high octain, coolant level

Question
I tried this yesterday and hit the send button before I was finished. I'll try again.. I have a Jeep Rubicon 06 brand new when purchased by me last year.24,700  easy miles on it now. Has been to the jeep dealer 3 times in that year for the same problem and still no satisfaction. 1. Coolant level keeps dropping to the add mark 3 times now.. Jeep dealers solution, normal evaporation. 2. Terrible Spark Knock getting worse since the first time we took it in..(I have always used the manufacturers recommended 87 Octane) Dealers solution: Use a LOWER grade Octane...cmon now..... 3. Tweety bird noise in front . Dealer Findings..Drive shaft never had grease when shipped from the manufacturer .Will install new drive shaft. My questions....Is THAT much evaporation normal....(Chrysler corp..says no itself....and The spark knock....what else could be the problem...They sopposedly have checked all avenues... Thank you in advance, Kristen

Answer
the fuel would be 93  not 87  93 is high octain and will get rid of the spark knock.
U cant get lower then 87.
SUBJECT:
Squeal-Like Sound Due To Incorrect Pre-Load On Clutch Throw-Out Bearing
OVERVIEW:
This bulletin involves diagnosing the clutch throw-out bearing for an incorrect pre-load
condition and making the appropriate repairs.
MODELS:
2007 (JK) Wrangler
2006 (TJ) Wrangler
NOTE: This bulletin applies to vehicles equipped with a NSG370 manual
transmission (sales code DEH).
SYMPTOM/CONDITION:
The customer may experience a squeal-like sound coming from the clutch throw-out
bearing when the clutch pedal is fully released.


the coolant leak  just haft to look for leaks  it will be red and crusty.