Why Your 2017 Can-Am Spyder RT Limited SE6 Is Using More Fuel Than It Should
Shop parts for a 2017 Can-Am Spyder RT Limited SE6 Motorcycle.
Your 2017 Spyder RT Limited SE6 is a liquid-cooled, fuel-injected, four-stroke touring machine: a 1330cc inline three-cylinder turning a belt final drive through a six-speed semi-automatic transmission. None of that was built for thrift. It is a heavy three-wheeler with a tall windshield, broad bodywork, and enough luggage capacity to load it down for a week on the road, so it will always ask for more fuel than a light two-wheeler of similar displacement. The useful question is not how it compares to something else — it is whether your own fuel use has changed, and if so, what is causing it.
First, Prove the Change Is Real
Before chasing a mechanical cause, confirm the pattern. Fill the tank to a consistent level, reset the trip meter or write down the odometer reading, ride normally, then refill at the same pump and note how much fuel went in. Divide the distance ridden by the fuel added, and repeat that over several tanks. A single tank tells you almost nothing, because wind, traffic, and how hard you twisted the throttle that day can swing the result noticeably.
One easy way to fool yourself is a tire change. If you fitted a different rear tire size or profile than before, the speedometer and odometer readings shift, and your calculated economy can look worse even though the Spyder is burning exactly the same amount of fuel. Riders who never calculate anything and simply notice they are stopping for fuel more often are picking up on the same signal, just less precisely.
Conditions and Riding Habits That Quietly Cost Fuel
Cold weather is the most common innocent explanation. A cold engine needs a richer mixture until it reaches operating temperature, and cold, dense air requires more fuel to maintain the same air-fuel ratio. Winter-blend fuel also carries slightly less energy per gallon than summer blend, and ethanol-blended fuel does the same. If your mileage drop arrived with the first cold snap, you may be looking at weather rather than a fault.
How you ride the RT matters just as much. The Spyder presents a large frontal area, so headwinds and sustained highway speeds cost disproportionately more fuel than they would on a faired two-wheeler. Adding a passenger, filling the side cases and top case, and running a tall windshield all increase the load. Short trips where the engine never fully warms, long idling warm-ups in the driveway, and aggressive throttle use all push consumption up. If you leave the SE6 in manual mode and hold lower gears longer than the automatic shift logic would, you are burning fuel for no benefit.
Rolling Resistance, Drag, and the Belt Drive
Tire pressure is the cheapest thing to check and one of the most common culprits. The RT carries substantial weight across three tires, and a few pounds low on any of them raises rolling resistance noticeably. Check all three cold, and check them again after the Spyder has sat for a week, since slow leaks are common.
A dragging brake is next. After a ride, carefully feel near each wheel for unusual heat, or look for a disc that has blued or a wheel that is reluctant to turn. A caliper that is not fully releasing, or a parking brake that is not completely disengaged, will drag continuously and cost fuel on every mile. On a belt-driven Spyder, belt tension and alignment also matter: an over-tightened or misaligned belt adds drag and often announces itself with a whine or chirp. Oversized aftermarket windshields and large accessories bolted to the bodywork add aerodynamic drag as well.
Air Intake and Ignition
A clogged air filter restricts airflow and can push the mixture rich, which wastes fuel. If the filter has not been inspected in a while, that is a sensible early check. Spark plugs matter too. Plugs that are worn, fouled, of the wrong heat range, or gapped incorrectly can fail to ignite the mixture cleanly, so some of the fuel you paid for leaves the engine unburned. Your Spyder uses electronic ignition, so there are no contact points to wear or timing to drift, but the plugs themselves still degrade with mileage and deserve a look.
Fuel Injection and Sensor Problems
On a fuel-injected machine like this one, the engine management system decides how much fuel to deliver based on sensor input, and a sensor that lies will cost you fuel. An aging oxygen sensor responds slowly and can bias the mixture rich. A coolant temperature sensor that reports the engine as colder than it actually is will keep the system in enrichment longer than necessary. Dirty or leaking injectors spray poorly and deliver more fuel than the engine can use efficiently.
If your Spyder's engine uses multiple throttle bodies, they can drift out of synchronization over time, which hurts both smoothness and economy. Stored fault codes are worth reading even if no warning light is showing, since a fault can be logged without an obvious symptom. Finally, check for actual leaks: a strong fuel smell, damp staining around fittings or the tank area, or a fuel cap seal that no longer seals will all reduce the fuel that actually reaches the combustion chamber.
Engine Condition and Cooling System Health
Low compression from general engine wear — worn rings, poorly sealing valves, or valve clearance that has drifted out of specification — reduces the efficiency with which the engine converts fuel into forward motion. This tends to develop gradually, so the mileage drop creeps up on you rather than appearing overnight.
Because this Spyder is liquid-cooled, the thermostat deserves attention. A thermostat stuck open keeps the engine from reaching full operating temperature, and a cold engine runs richer than a warm one. Low coolant or air trapped in the system can produce a similar effect. If the temperature gauge reads lower than it used to on a normal ride, that is a clue worth following.
Modifications That Change Fueling
An aftermarket exhaust or a high-flow air filter installed without matching fuel tuning is a frequent cause of rich running. The engine management system can only compensate so far, and a combination that flows more air than the calibration expects often ends up delivering more fuel than the engine needs. A taller rear tire changes effective gearing and odometer accuracy at the same time, which muddies your measurements as well as your fuel use.
When to Hand It to a Mechanic
Some symptoms point to something deeper than a low tire or a dirty filter. A persistent strong fuel smell, black exhaust smoke, spark plugs that come out sooty, rough running alongside the mileage drop, or a dashboard warning light if your Spyder displays one all justify professional diagnosis. The same goes for a drop that survives the basic checks — tire pressures, air filter, plugs, and a careful look for leaks. Describe what you have measured, how many tanks you tracked, and when the change started; that history is often more useful to a technician than any single symptom.
Related Shopping Categories
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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.
