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Rlarue's avatar
Rlarue
Explorer
Mar 08, 2016

Using a vacuum guage and gear selection towing for best MPG?

I tow a 2014 KZ Spree 260RKS, loaded weight close to 7,000 lbs, with a 2004 Ram 1500 5.7L Hemi. I have a vacuum guage installed and tapped into the manifold vacuum. I have not been able to resol...
Tow Vehicles
N-Trouble's avatar
N-Trouble
Explorer
Mar 08, 2016
Vacuum gauge?

Does your truck have an avg MPG readout? If so you can settle this really easily. Get up to speed on the highway and reset the avg MPG meter. Drive it for a few miles and record the avg MPG. Shift to the other gear while holding the same speed and repeat. Done...

Lower RPM doesn't always mean better mileage if your lugging the motor. Tans may suffer as well.

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