by Garth W. Cane
Gas OR Diesel Engines? (35-7)

Garth Discusses the Pros and Cons of Gas and Diesel Engines

Many owners of gas-powered motorhomes wish for the power of a diesel engine, so they can climb long, steep hills without having to slow down. You’ll know the kind of hills I’m referring to if you’ve ever come through the east entrance of Yellowstone Park or driven Highway 15 leading out of Los Angeles towards Las Vegas. These are situations I’ve often wished for the performance provided by a diesel engine.

Gas powered Class A motorhomes have mid-door entry, because the engine is mounted up front. This placement of the engine creates a ‘doghouse’ that you have to climb over in order to get into the driver and passenger seats. Not an easy feat for some older RVers! A diesel, pusher engine by comparison, is hidden under the bed in the rear, providing a flat floor up front and a quieter environment since the engine noise is now further back.

Historically,diesel-powered motorhomes have been more costly than their gas cousins due to the higher cost of the engine, a heavier frame, and larger tires that support the extra weight. If a Class A with a gas-powered engine weighed 15,000 pounds, than the diesel-powered version would likely weigh 25,000 pounds or more. It’s not uncommon to see diesel units costing as much as $50,000 more than the gas unit with the same floor plan.

I did a cost analysis for a reader a few years ago on the value of a rear diesel’s fuel savings versus the lower price of a front, gas-engine motorhome (both with the same floor plan). The reader informed me that he was only going to drive about 5,000 miles a year (typical mileage for many RVers). Based on the cost differential of the units, the superior fuel economy of the diesel engine, the cost of fuel at the time, oil changes, and general maintenance, he would have to drive the motorhome for 197 years to make up for the extra investment of funds. I suggested to him that his wife would be tired of the upholstery by that time.

You do not buy a rear-diesel motorhome to save money. You buy it because you want it. Most RVers are not driving long distances like truckers who travel hundreds of thousands of miles each year.
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