9300 miles and I love my L3B. I drive 60 mph on hwy here and get 26.2 mpg pretty consistently if no wind. Of course wind, weather ( snowing today) and grade on mountain highways not to mention I am off road for 7-8 miles once off 2 lane highway when I go anywhere.
This engine likes 87 octane or higher. 85 octane is regular here but after scanning saw more timing being pulled on 85 octane. 87 or mixed up to 88 or so makes less timing retard and better MPG.
We've done 3 oil analysis so far with great results. Amsoil OE 5w30 being used and I changed out OEM air filter at 8600 miles because of mountain dust. I have tested the OEM ACDELCO, QS synthetic, Mobil 1, and now Amsoil and going to stick with Amsoil.
I operate from 10,000' msl down to 7500' most of the time.
I drove up to Pueblo CO yesterday @ 75 mph on I-25 and saw 23 MPG. For a Trail Boss thats great. No one is having lifter or cams being eaten on this hand crafted valve train. If you have a new V8 beware metallurgy defects are gonna kill ya at some point. Shame really.
All these engines overfuel for cooling and that makes shellac that will damage weak lifters and cam alloys over a short interval as many are seeing. Good fuel and engine oil can really help.
I order my oil analysis here and love the service :
ISO Certified Oil Analysis
Nick Mikitka
Independent AMSOIL Dealer
Synthetic Advantage LLC
email:
sales@syntheticadvantage.com
Phone: 910-290-2371