See full version: Average RV Tank Size and Gas Mileage (MPG) Chart
On that note, if you can help it, don’t fill up your water tank until you are at your destination. Water weighs approximately 8.3 pounds per gallon. If you’re carrying roughly 50 pounds of water, you are carrying about 400 pounds of weight
We’ve noticed a few out of date posts and wanted to set the records just a bit straighter than they are right now.
It’s not a vehicle that you want to constantly drive into a gas station, so a vehicle of this size and weight require an RV tank’s version of a big gulp to keep it on the road.
Since we are discussing gas tanks and fuel economy, you should note that many Class As run off of diesel fuel. Diesel is often more expensive than gas, so take that into account for any cost calculations you might be making right now. more
Drive at 55 MPH Instead of 65 MPH (10 to 15 Percent Improvement) [links]
Breaking tank size down by class does give us a clearer picture of what we can expect. However, we can do better than that. This is still a low-resolution answer to a question that deserves a high-resolution response.
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When you click calculate the amount of gas needed for your trip will be calculated. Distance and mpg are required to make the calculation!
Because the carbon dioxide (CO2) is created from the carbon (C) in the fuel AND the oxygen (O) in the air, it's heavier than the fuel burned to produce it.
To find out the gas cost for your trip you need to know your cars fuel economy (mpg), how many miles you will drive and the price of gas. here
When you know these parameters, enter them into the trip cost calculator above and it will spit out an estimate. [links]
Like it is with vehicle weight, larger vehicles are less susceptible to fuel efficiency loss since they are not too aerodynamically efficient in the first place. On the other hand, the size of the rooftop cargo also plays a role – the larger it is, the higher the fuel efficiency penalties will be.
The referenced paper cites a number of reports, in which the predicted increase in % of MPG/psi ranged from 0.1 up to 0.6%, with 0.308% being their average. Even a 0.1% effect is going to make a difference – in tires with 80% of proper tire pressure, the fuel economy loss would probably be 2%, which is going to result in huge fuel costs in the long term. [links]
This also explains why the fuel capacity is very similar in all the models we’ve picked. About 25 gallons may seem very little after the 80-150 gallons of class A motorhomes, but given the weight of class B RVs, 25 gallons is very good fuel capacity. more
Hauling cargo on the roof of your RV is another thing that you may want to avoid, if possible. And it’s not only about weight efficiency – it still plays a role, but with on-roof cargo, another problem is aerodynamic drag (wind resistance). [links]
In fact, according to Southeast Financial , diesel engines can be 30% more efficient than their gas counterparts.
Overall, it is considered that diesel motors are more efficient than gasoline motors, which is the thing that allows them to have not only heavier weight but also better towing capacity. Hence the increased fuel capacity in diesel RVs.