Why Your 2011 Can-Am Spyder RS SM5 Is Using More Fuel Than It Should
Shop parts for a 2011 Can-Am Spyder RS SM5 Motorcycle.The 2011 Can-Am Spyder RS SM5 is not a conventional motorcycle, but its thirst for fuel still obeys the same basic rules. Under the bodywork is a liquid-cooled, fuel-injected four-stroke V-twin, shifted through a five-speed manual transmission and turning the rear wheel by belt. Because the engine is electronically managed, a sudden drop in fuel economy almost always traces back to one of a few areas: how the machine is ridden, how much drag it is fighting, how well it breathes and sparks, and whether the fuel injection system is getting accurate information. Working through those areas in order — starting with the free checks — usually narrows things down quickly.
Confirm the Change Is Real Before Chasing It
Riders often notice poor fuel economy as a feeling: more frequent fuel stops, or a tank that seems to empty faster than it used to. That instinct is worth trusting, but confirm it with numbers before replacing parts. Fill the tank, note the odometer or reset the trip meter, ride normally for the whole tank, then refill and divide the distance covered by the fuel added. One tank is not enough to draw conclusions, because a single windy day or long highway run can skew the result. Average several tanks before deciding something has actually changed.
Also rule out a lying odometer. A change in rear tire size, or a change to the belt pulleys, alters the relationship between actual distance traveled and what the instrument cluster records. If the speedometer reads noticeably high, the odometer is likely overstating distance too, which makes fuel economy look worse than it really is.
Riding Conditions and Habits That Quietly Cost Fuel
Before assuming a mechanical fault, consider what has changed about how the Spyder is used. Cold weather is a common culprit on its own, and winter-blend or ethanol-blended fuel can reduce economy further. So can a headwind, a long stretch of sustained highway speed, a passenger, or a loaded cargo area. The Spyder carries more weight and presents more frontal area than a two-wheeler, so wind and load affect it more than a rider coming from a conventional bike might expect.
Riding style matters just as much. The V-twin is happy to rev, and holding high rpm in a lower gear than necessary burns fuel for no benefit. Short trips that never let the engine reach full operating temperature, aggressive acceleration away from stops, and long idling warm-ups all show up at the fuel pump. If your commute or weekend route has changed recently, that alone can explain the difference.
Rolling Resistance: Tires, Brakes, and the Drive Belt
Underinflation is the most common and easiest-to-fix cause of poor fuel economy on any vehicle, and the Spyder has three tires to check rather than two. A tire that is down even a modest amount increases rolling resistance continuously, and the effect compounds over a long ride. Check all three cold.
A brake caliper that is dragging adds constant drag you may not feel through the bars. After a ride, carefully feel the wheels or hubs — one that is noticeably hotter than the others points toward a caliper that is not fully releasing. On the Spyder, also confirm the parking brake is fully disengaged before you ride.
Finally, the belt. A belt adjusted too tight, dried out, or running out of alignment robs power and fuel, so belt tension and condition belong on any fuel economy checklist for this machine.
Air Intake and Ignition
An engine needs the right mix of air and fuel, and a dirty or clogged air filter restricts the air side. The fuel injection system compensates, but the result is still a richer, less efficient burn. If the filter has not been inspected in a while, that is a cheap place to start.
Spark plugs tell a story. Plugs that are worn, fouled, or gapped incorrectly cause incomplete combustion, which wastes fuel and often shows up as rough running or a sluggish feel. The 2011 Spyder RS uses an electronic ignition, so there are no contact points to wear or drift out of adjustment — but the plugs themselves still wear, and reading their color is one of the most useful diagnostic steps you can take.
Fuel Delivery: When the Injection System Gets Bad Information
Because this machine is fuel injected, the causes here are sensor-driven rather than carburetor-related. If your bike is equipped with an oxygen sensor, a failing one can send the system incorrect information about the exhaust, and the engine may run richer than it should. A faulty engine or coolant temperature sensor can do the same thing: if it reports the engine as colder than it is, the system adds fuel for a warm-up condition that is not happening.
Injectors can also be a factor. A dirty or leaking injector delivers fuel unevenly, and a leaking one can bleed fuel when it should be closed. Stored fault codes are worth checking, since a sensor problem may set a code without an obvious symptom. Finally, do not overlook a simple fuel leak: a strong fuel smell, damp fittings, or a slow drip anywhere in the system wastes fuel and is a safety concern in its own right.
Engine Condition and Cooling System Behavior
As an engine accumulates wear, compression drops and efficiency with it. Low compression means less of the energy in each combustion event becomes motion, so more fuel is needed for the same performance. It is usually a gradual change accompanied by harder starting, reduced power, or increased oil consumption.
On a liquid-cooled machine like this one, the thermostat deserves a mention. A thermostat stuck open keeps the engine from reaching normal operating temperature, and a cold-running engine uses more fuel. If the temperature display never seems to reach its usual range, that is worth investigating.
Modifications That Change the Tune
An aftermarket exhaust or a high-flow air filter installed without matching changes to the fuel injection tuning can leave the engine running rich. More airflow without a corresponding correction in fueling often means the system delivers more fuel than the engine can use efficiently. If the mileage dropped right after a modification, that timing is a strong clue.
When to Hand It to a Mechanic
Some symptoms point toward a deeper problem than a dirty filter or a soft tire. A strong fuel smell, black exhaust smoke, sooty spark plugs, rough running alongside the mileage drop, or a dashboard warning light (if your bike has one) all justify a professional diagnosis. So does a fuel economy drop that persists after you have checked tire pressures, the air filter, the plugs, and the belt. Describing what you have already ruled out, and when the change started, will help a technician get to the answer faster.
Related Shopping Categories
Shop Fuel System Parts for a 2011 Can-Am Spyder RS SM5 Motorcycle.
Shop Air Filters for a 2011 Can-Am Spyder RS SM5 Motorcycle.
Shop Tires for a 2011 Can-Am Spyder RS SM5 Motorcycle.
Shop Brake Parts for a 2011 Can-Am Spyder RS SM5 Motorcycle.
Shop Spark Plugs for a 2011 Can-Am Spyder RS SM5 Motorcycle.
Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.
