I just dont see the point....gas is like 2.75 here and diesel is 3.18...plus the extra oil during changes, filters, matience, etc etc, the few extra MPG you get just aint worth it....and 6.2/6.5's just dont make a whole lot more torque then a healthy small block, and a good running big block will eat one.
But to each there own i suppose. Personally id run a 6.9L with a turbo....Those were really, really good engines, and stronger then the 6.2/6.5 if you keep them stock.
later,
Dustin
i believe you cant understand. and in many cases your fuel comparison is almost worth consideration. if a guy drives 8-15 k a year....well hell who cares right??
i tend to run 35-50k plus, lots and lots of hiway
your metric has this in my case for 50k from past powertrain line ups
2.9 410 gears 33 tires a4ld-2.75 gallon $9821.00
5.0 (ho/gt40) aod 4.10 gears 2.75 gallon $11956.00
6.5 n/a 4l80 4.10 gears 3.18 gallon $8368.00
THATS FREE TIRES AND MAINTAINANCE AND SOME SPARE CHANGE FOR FOOD.
over my gas v8 thats over 3500 savings.....thats new mud tires and street tires for free and hell i can buy a fresh 6.5 every year too...so fawk changin the oil
funny thing too, engine choice was partly due to oil changes and overall cost of operation.. its one quart extra, and i burn it in my tank when i am done using it as a lubricant, so my oil changes are actually cheaper over the previous gassers.
if i had a psd, it would be 6 dollars more per change over my healthy smallblock. with filters thats a whopping 130 bux more

....so you dont have any way to say it costs more....cause that oil would go in the tank with the psd too

of course my psd would not leave me missing my smallblock. the 6.5 does leave me missing it. the na 6.5 does very well on the road and i have no complaints, comparable to a 4.0 gasser in feel. but it has to have a turbo to be respectable.
now, in my current configuration my small block would be lucky to see better then 9 mpg.
i have 300 bux into a complete turbo setup and spare engine with less then 15 k on it.
if i actually did the proper maintenance to this 300k plus 6.5 it would greatly improve economy. but its just now getting to the point to where i am considering it....years later after installed and run hard.....injectors are scheduled for 60k intervals....but i keep it to 360 k

cheaper.

so yeah......those few mpg different really arent worth it
just cant see the point?
on edit....
in that configuration......its equivalent to towing a 7000 pound load....and still got better economy town then my gasser with 33's.
think about that for a minute