Quick Answer: Why Is My Diesel Getting Bad Mileage?

How many MPG does a 6.6 Duramax get?

The 33 mpg highway figure should come with an asterisk though, since that’s for two-wheel-drive pickups.

Buyers who opt for four-wheel-drive models will manage figures of 29 mpg highway and 23 mpg city.

Right now, that makes the 2020 Silverado the most fuel-efficient full-size diesel pickup on the market..

What is the best additive for diesel fuel?

Best Sellers in Diesel Additives#1. … Howes 103060 ‘Diesel Treat’ Diesel Conditioner and Anti-Gel – 64 oz. … Blue Def DEF002-2PK Diesel Exhaust Fluid, 2.5 Gallon, 2 Pack. … Lucas 10003 Upper Cylinder Lubrication & Injector Cleaner 32 oz. … Hot Shot’s Secret Diesel Winter Anti-Gel 16 oz Squeeze Bottle, 16.More items…

Will DPF Delete increase fuel mileage?

Removing your DPF will make a bigger difference, depending on your engine, around +10% power increase, and also less fuel consumption.

How can I get better gas mileage in my Diesel?

12 Tips to Improve Diesel Fuel MileageTurn your engine off. … Use shore power when you can. … Avoid revving the engine. … Find your engine’s sweet spot and run with it. … Use your air conditioner as sparingly as possible. … Anticipate upcoming traffic lights. … Maintain an extended following distance. … Lower your average highway speed.More items…

What can cause poor fuel mileage?

The Main Causes of Bad Gas Mileage (And What To Do About It)Incorrect Tire Pressure. This is very common and it’s also the easiest to correct. … Spark Plugs. If spark plugs are misfiring or performing poorly, your gas mileage will be affected. … Bad Oxygen Sensors and/or Air Filters. … Driving Habits. … Bad Fuel Injectors. … Air Conditioner. … Motor Oil. … Idling.

Why is my car using more diesel than usual?

For instance, a faulty spark plug or O2 sensor in a petrol engine and a dirty fuel injector in a diesel engine can cause more consumption of fuel resulting in low fuel mileage. … This will eventually cause your car to consume more fuel than usual.

Does diesel get more mpg?

Diesel engines are more fuel-efficient and have more low-end torque than similar-sized gasoline engines, and diesel fuel contains roughly 10% to 15% more energy than gasoline. So, diesel vehicles can often go about 20% to 35% farther on a gallon of fuel than their gasoline counterparts.

Why is my diesel truck getting bad mileage?

Incorrect tire pressure is a common cause of bad gas mileage. … If they misfire, or are working poorly, this can affect your gas mileage in a negative way. Having bad fuel injectors can cause bad mileage. This is because the fuel injectors are responsible for putting fuel into the engine.

What is the disadvantage of diesel engine?

The major disadvantage associated with a diesel powered vehicle is the upfront cost. While it’s true that diesel engines do get better MPG than gas powered engines, this is offset because diesel cars are more expensive than their gasoline powered counterparts.

Does engine oil affect fuel consumption?

You can improve your gas mileage by one to two per cent by using the manufacturer’s recommended grade of motor oil. For example, using 10W-30 motor oil in an engine designed to use 5W-30 can lower your gas mileage by one to two per cent. Thicker oil is harder to pump.

How often should fuel filter be changed?

one to two yearsFuel filter replacement Sources online estimate filters should be replaced as soon as every 20,000 up to 40,000 miles or more. “If none is specified [in the owner’s manual], replace it every one to two years depending on miles driven,” Kreitzer says. “Thirty thousand miles is a good idea for a ballpark interval.”