This past week I put the Duraburb to the test. I towed a car hauler with my Yukon on it, while towing a wave runner behind that. The entire rig towed very well as a unit. I don't plan on towing the double trailer set up again, but I was surprised at how stable it was.
The most interesting part was the fuel economy. I averaged 11.9 MPG at around 70 MPH. I filled up outside of Shreveport, LA and drove straight to Pensacola, FL using half a tank of fuel. Tomorrow I am heading to Orlando to pick up my supercharged 6.0 that was in my truck before. Eric was nice enough to store it until I could come pick it up. I will post some new MPG's in the next day or two.
This will also give me the opportunity to check out Eric's shop and give my opinions on that.
Nice job on conversion!
I suspect something wrong w/your mpg's have you corrected the VSSB for tire size, or?
I have crunched the numbers many times for my burb w/NAVISTAR 6.5 turbo diesel and get constant 22 mpg @ 60 mph when seriously loaded or towing (less than 5k lbs) take maybe 4 mpg's away from that figure.
Can lift and the tire selection have such a negative effect on mpg's?
Last edited by FellowTraveler; 07-16-2012 at 09:24 AM.
1999 GMC K2500 BURBAN, NAVISTAR enhanced 6.5 td aftercooled, dual alt's, PSC p/s pump w/HD cooler, redundant FSD's, HEATH program, turbine/downpipe wrapped, 4" SS exhaust, real time OBD2 data logging w/device controller, EVANS waterless coolant @ zero (0) psi & 135 gpm pump, 4L80e w/kevlar and premium steel w/cryo treated input/output shafts running @ 100 deg. F & 140 deg F towing, all synthetic fluids, AMSOIL bypass system, MileMarker hydro, dual fuel tanks, and on and on, questions PM me.
This has been a fascinating thread as I have been thinking about a project like this (wife, 3 kids and a dog! LOL) but it is technically beyond my expertise. Thank you so much for posting it and providing so much information about what you went through. What a great truck!
As to the mileage/break-even discussion here is how I see it- if a gas version gets 8 mpg and the diesel gets 14 (in your experience) and diesel costs $0.50 more per gallon it would require you to drive 98,823 miles to breakeven with a $15,000 conversion cost. If the difference between the fuels is $0.75 per gallon it would require 112,000 miles to breakeven. If you WERE able to get 20 mpg (which given the gears and tires seems unlikely) your breakeven would be 63,000 miles. So it COULD be done for cost reasons depending on how long you keep the vehicle and how often you drive it. If you tow heavy loads a lot then that would decrease your breakeven point even more given the greater impact on gas powered vehicles vs. the (minimal) impact to a diesel. In theory this would make a lot of sense for a daily driver/brand new vehicle if someone had the coin (assuming it was still only a $15,000 upfit cost). Just my $0.02.