Maximizing LLY fuel mileage

[Finman]

I ran a trip Minnesota to Kentucky. A hair under 1900 miles all freeway cruse on 70-75mph. I have a Hypertech tuner and ran it in stage 3. 17.4 MPG hand calculated. Not impressed. Would have got 21-22 with my 02. Black smoke when you put the wood to it and alot of it. Anyone have any thoughts on that? Does not seem to smoke when running in stock.

[Mark Rinker]

My Hypertech tuner is great at adding fuel (power) but not so great at adding enough boost to burn all that extra fuel (black smoke).

If I were running down the road unloaded and wanted max mileage, I'd either add enough boost to burn the extra fuel, or return the truck to stock settings for the trip.

Your speed of 70-75 has alot to do with it. In fact, I'm a bit suprised that your LLY did that well!

Next trip try stock settings and see how you do, or call JK and add a BoostStick and enjoy the extra (although probably unused) power...