Is it possible to produce HDR from one image in LR?

Question

I have been shooting a lot of images from inside a vehicle and using flash to fill in inside and ballance with the light outside.  The images are pretty well ballanced but have some dynamic range issues.  I am able to get a better output by tweaking the image towards higher exposure and a lower exposure and a middle exposure and blending these HDR style to get a better image.
I am trying to find a way to automate these multiple exposures or maybe create a presets to do this to speed up the process.  Any suggestions on how to make this easier?

Answer 1

Thanks for all the repsonses so far.
After reading your suggestions and playing around with some of your ideas, I have come up with a slight change in goals:  I am really not looking for an HDR per se I just want to recover a little more of the details lost with my current photographic technique, that i can not pick up with Fill Light and Recovery.  I find situations where Fill light adds then Recovery subtracts often offsetting the work of each other.  I have both darks and lights in these images that need coaxing out.
The photographs I am taking are from a cockpit of an airplane that I am also flying.  Since I am a little preoccupied during the flight with other tasks, I need to set up the camera and flash before the flight.  If I am lucky I am able to reach up and change the shutter speed to compensate for a change in outside light conditions.  I am getting some great images as the terrain and conditions are pretty and unique.  But the exposures and ballance are seldom perfect.
When I first did this, I painstakingly increased density in one area then painted a feathered mask by hand to get a better density of the outside the portion of the shot.  This was painstaking for 30+ images but worth it.  Someone told me about the luminance mask thing and that was much easier and made an great improvement in the shots.  I am having trouble finding the tutorial on this technique, I used before but will continue searching for it.  Any suggestions?
I have been playing with the Photomatix by exporting 3 images from the same raw image with 3 different exposures but am not liking the results,  I either get strange surreal images or crazy kinds of noise. I guess I need to get the tone mapping concept a little better.  I have played with some bracketed images I took in Napa last year (not from the cockpit) and am liking the result, I am excited to start working with HDR.  I just think Photomatix may be too agressive for this purpose.  I will play with Enfuse/LR pairing to see what it can do.
I am now setting the camera up on a Intervalometer and taking many shots over the course of a flight.  I would eventually like to do a time lapse or slide show with the images.  This could mean lots and lots of images to manipulate.  Depending on the outside scenery there may some images I want to hand improve with Photoshop, but not 400 images at a time.  I am hoping for a better workflow to process these using some sort of automation.  The one possible step that will make it easier is the camera is mounted in a fixed position and the only variable throughout each picture is the lighting outside.
I am marking this question as answered because you have all given me enough information to work with but doesn't mean I would not appreciate any suggestions on further improving a method or ways to automate this process.  Also attaching a photograph I took.  This one is a rare example of one that is very ballanced with just a little tweaking in Lightroom, this is a fairly rare occurance though.