Do any of us have a Workhorse with a Vortec 8.1 Yes, I do
What kind of millage,,, I'd have to check but I think around 8 on the average (Rig is a 37'7" Damon Intruder Motor Home)
How to maximize millage
The first thing you can do to improve millage is OBEY ALL SPEED LIMITS I watched the "instant millage" meter as I drove out to the dealer from my Daughter's house a couple of weeks ago... Leaving daughter's on 8mile rd (45mph) is was doing about 10/gallon, hit the 65 MPH freeway and that got cut almost in half.
SPEED EATS GAS
Second, be gently on acceleration, do not drive hard, slow down in advance of red lights instead of standing on the brekes when you get there,,, in fact try to avoid red and get there when it's green if you can. also when it turns green do not FLOOR it but accelerate gently.. try not to spill your partner's coffee in his/her lap.
Tires, Maintain in good condition, check pressure often (I check mine every few minutes when driving, Ask how, but ask Bernie, not me)
Lubrication, DO IT regular oil chainges and lube jobs, pay attention to all engine and chassis maintance issues
WAX, yes WAX your rig, wax can make it more slippery so WAX it.
Finally, www.workehorse.com Send them an E-mail or otherwise register your rig, there are benefits to registration
(I got my benefit package today in fact)
I'm liking this rig, Drives well, good power, only issue is I can't see the dash guages due to the steering wheel... If you have the same issue and the "Standard" wheel (I have the delux) let me know.. Perhaps we can solve each other's problems