I am on your side as far as the diesel issue, but you don't have the numbers right in bold. Using your number of $3899, a fleet of four machines that are diesel would be $15596 extra up front. That's a lot of extra to try to equalize. Regardless of that- Diesel here is a lot more than $3.50 even for off road diesel. Closer to $3.80 for off road if you have access to it. 1.8 gph x 700= 1260 gallons per year for gas. x $3.50= $4410 per year for gas. .8 gph x 700= 560 gallons per year for diesel. x $3.80= $2128 per year for diesel. 4410- 2128= $2282 saved per year in fuel costs. If you keep the machine for 3 years you'll spend an extra $1300 each year for the up front cost over the gas model. $2282- $1300= $982 per year in fuel savings with the diesel, and that is before figuring the added cost for fuel in the tow rig, maintanence etc. Add in higher maintenance costs for the diesel, added weight to pull with the tow vehicle (which does add up over a year, especially with more than one on the trailer), and it's about a wash. Since many guys trade every two to three years, they have barely broken even at trade in time, so why bother? I'm just telling you what many, many guys have posted repeatedly here on LS about why they don't bother with diesel.