When Tony helped Casey get the gas cans 6/23 he stated he picked her up walking down S. Chickasaw....and, IIRC, that she'd run outta gas in a subdivision nearby that she cut through on the way to her house.
Attached link suggests a possible route for the "cut through" that Casey may have been using. This appears a bit more tortuous than the more obvious use of Curry Ford Rd to make the connection between Goldenrod & Chickasaw, but, perhaps the left-turns required when using Curry Ford (left turn from Goldenrod onto Curry Ford Rd when traveling TO G&C's and left onto Curry Ford Rd from Chickasaw when traveling FROM G&C's) were a pain.
http://maps.google.com/maps/ms?ie=UTF&msa=0&msid=104911739131657185086.0004604b04c5a84b2de99
Using the worst-case distance scenario of running outta gas near the intersection of Quail Pond St. as a basis. There is a gas station @ the next intersection (0.15mi)...Goldenrod & Pershing IF she used this route...
suggesting she'd be closer to Chickasaw than Goldenrod when she ran outta gas.
IF this is the route she used then it would've taken her less than 45mins to walk to G&C's (2.5 mi @ 3.4 mph)...less than a 1.5hr roundtrip w/ 2nd half carrying gas can(s)...this gives some insight into the decision she'd hafta weigh IF the body were still in the trunk...hoof it...or call for help and risk it. I'm not suggesting Casey would have done this analysis...just sayin' by a gut feel this is what she woulda had to think about. IMHO...that she called Tony for help suggests the body was no longer in the trunk...just odor.
Plenty of options, but, just an example from her cell log....
1:41:37 PM INCOMING CALL Amy H. Casey A. 0.2 Tower 57: 0.5 mi NW of TonE L Apt
2:44:06 PM OUTGOING CALL Casey A. Tony L. (Cell) 2.5 Tower 22: 1.5 mi NW of Anthony Home
2:51:37 PM OUTGOING CALL Casey A. Jesse G. 0.0 Tower 22: 1.5 mi NW of Anthony Home
2:51:59 PM OUTGOING CALL Casey A. Amy H. 10.9 Tower 22: 1.5 mi NW of Anthony Home
3:02:03 PM INCOMING CALL Tony L. (Cell) Casey A. 1.4 Tower 22: 1.5 mi NW of Anthony Home
3:04:05 PM OUTGOING CALL Casey A. Amy H. 9.6 Tower 22: 1.5 mi NW of Anthony Home
3:19:36 PM INCOMING CALL Mark H. Casey A. 5.5 Tower 8: 1.5 mi S of Anthony Home @ Tow Yard
4:01:14 PM INCOMING CALL Tony L. (Cell) Casey A. 0.8 Tower 36: 1 mi NW of Chris S Home, 1.5 mi SE of Amscot
4:08:04 PM OUTGOING CALL Casey A. Tony L. (Cell) 0.4 Tower 58: 0.5 mi NE of TonE L Apt
Say the 2:44PM call to Tony pinging near G&C's is either a conversation or vmail ..."Hey, can you help me...I'm outta gas near such & such". Casey may sit in the car and talk w/ Amy while she waits...or she may be walking. She talks w/ Amy for 11mins and gets an incoming call from Tony @ 3:02PM..."OK, where are you?". Casey calls Amy back and tells her she's being rescued in a few minutes and talks for another 10mins. After getting off the phone w/ Amy ~3:15PM perhaps Casey starts walking...at least wanting to keep Tony away from the smell in her car. She TAKES the incoming call from Mark H. @ 3:19PM and talks for 5.5mins indicating that Tony hasn't arrived yet. Sooo...just for grins...perhaps she started walking @ 3:15PM...she would've easily made it to Chickasaw (0.9mi @ 3.4mph = 16mins) by the time Tony arrives sometime after 3:25PM.
By 4:01PM calls are pinging well on the way back to Tony's. While pings coulda been before she actually reached Tony's for est. say she was there and it takes ~23mins to drive from G&C's if she went directly...so 4:01PM less 23mins means she finished filling up the Pontiac around 3:38PM. This left ~3:38PM - 3:25PM or ~13mins to be picked up, drive the <1mile balance to G&C's, get the gas cans and get back to the Pontiac. Tight...but within the margin of error for some of the assumptions. Almost left out them bein' seen by Brian B. in that ~10mins they were @ G&C's.
I dunno if all of the above reconciles w/ statement details given...perhaps someone more familiar w/ statements can poke holes in it.
I just noticed this potential cut-through subdivision route when looking for the Brackenwood house yesterday and thought I'd toss it in here.