Garmin RV GPS
RV-aware routing, so you skip low bridges and the long way around.
Price is shown on Amazon. It is not stored on this site.
On the road
Fuel savings
Water is heavy and wind is expensive. See what your tanks weigh and, if you want, what easing off the throttle might save.
Updates as you typeSame math as the original Megawatt tool
Weight you’re hauling
Baseline weight
0lb
Water on board
0lb
Easing off the throttle
Labeled estimateFrom the original page
TireMinder TPMS
Watches tire pressure while you drive. Soft tires cost fuel.
Price is shown on Amazon. It is not stored on this site.
How the math works
Class baselines and the notes on aerodynamics come from the live Megawatt widget. Its script was cut off in the middle of the fifth-wheel branch, before any gallon formula, so that part is gone. Water uses 8.34 lb per gallon. The optional estimate uses gallons saved = trip ÷ MPG × (1 − new speed² ÷ old speed²), which assumes drag dominates. Treat it as a ceiling.