Gas mileage isn?t as good as I thought it was...
For the last year that I?ve had the duramax in the H2, I?ve been using the DIC to check the gas mileage. Now I know it uses algorithms to calculate the necc. info but I thought it would be fairly accurate.
Last year I drove from NC to FL at about 80 mph and the DIC said I was getting 20 mpg over a 1500 mile trip.
This weekend we drove the same 1500 mile trip averaging 85-90 and the DIC said 17.7 mpg.
A few thoughts...
I?m running the second to highest tune available. (the highest tune allows more mpg but you can?t tow with it)
My odometer and speedometer are right on the money so I?m assuming the DIC is using the right data.
Anyway, calculating the mileage by hand, the gas mileage only ended up being 13 mpg.
That seems more realistic running 85-90 mph but disappointing all the same.
I?m gonna run a long trip at about 60 and see what kind of mileage I really am getting.
Even if the gas mileage is that crappy, it?s still worth the swap for the power.
Mark
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