What will this trip really cost?

How this calculator works

You enter the round-trip distance, your vehicle's MPG, the price of gas, how many nights of lodging (if any), and how many people are splitting the cost. The tool multiplies distance by fuel price and MPG to get a fuel total, adds a flat per-mile wear-and-tear allowance for tires, oil, and brake life, adds your lodging total, and divides the whole thing by the number of travelers.

The wear-and-tear figure is a generalized average for a typical mainstream vehicle driven at a steady highway pace. It isn't specific to your car's tire size, brake pads, or oil type, and it doesn't rise for towing a trailer or hauling a full load of passengers and gear, both of which add real wear.

What's left out: food, tolls, parking, activities, and any repair that comes up unexpectedly on the road. It also assumes your MPG holds steady across the whole route, which won't be exactly true if the drive includes long climbs or heavy headwinds.

Using the result to decide something

• Compare driving against flying by adding your own estimate for tolls, food, and time to the number this tool gives you.
• If you're taking two vehicles versus one, run the numbers both ways — splitting lodging often changes the answer more than fuel does.
• Round up on the wear-and-tear line if you're towing, loaded heavy, or driving a larger SUV or truck.
• Add a buffer for a mountain route — fuel use on sustained climbs runs above a flat-highway MPG assumption.
• Use the per-traveler number to set expectations before the trip, not to split costs to the penny afterward.

Inland Empire and High Desert road trips

Trips out of Fontana, Ontario, Rancho Cucamonga, Riverside and San Bernardino often start with a run up I-15 through the Cajon Pass, a sustained grade that pulls fuel economy down on the climb and puts real load on brakes on the way back down. Drivers starting from Victorville, Hesperia, or Apple Valley are already past that climb but still face long open-desert stretches where summer heat pushes engine and cooling systems hard, especially with the air conditioning running the whole way. Dust and grit on desert routes and unpaved pullouts can also work into tires and brakes faster than a city commute would, which is part of why the wear-and-tear line matters as much as fuel on these trips.

Road trip cost questions we get most

What is the wear-and-tear number based on?

It's a flat per-mile allowance meant to represent tires, oil, and brake life used up over the trip, applied to a typical mainstream vehicle. Trucks, SUVs, and vehicles on performance tires wear parts faster per mile, so their real cost runs higher than the estimate.

Does this include lodging and food?

Lodging is included if you enter it. Food, tolls, parking, and activities are not built into the calculation — add those separately for a full trip budget.

Does it account for mountain grades like the Cajon Pass?

No. It applies your MPG figure evenly across the whole trip. Sustained climbs use noticeably more fuel than flat highway miles, so a route that includes a mountain pass will likely cost a bit more in fuel than the flat estimate shows.

How is cost per traveler calculated?

It divides the total trip cost by the number of people you enter, evenly. It doesn't account for anyone paying for their own meals or a separate hotel room.