The Sierra is a truck that gets 30 MPG on the highway but only 23 MPG in the city.
The truck that wastes the most gas is the Ford F-150 Roush Performance which gets a mpg of 12 mpg.
Older Ford F-150 and F-350 trucks also get poor gas mileage when compared with other trucks so they waste the most gas.
A list of trucks that wastes the most gas are.
2020 Ford F-150 Roush Performance – 12 mpg.
2021 Toyota Tundra 4WD – 14 mpg.
2021 Chevrolet Silverado – 16 mpg.
2021 GMC Sierra – 16 mpg.
2020 Ford F-150 Raptor – 16 mpg.
2020 Ram 1500 – 17 mpg.
2021 Nissan Titan – 18 mpg. Nissan.
2020 Ford F-150 – 19 mpg
You get better gas mileage with a truck bed cover as the truck bed cover seals the pickup bed from the airflow that your truck bed when open would catch.
The truck bed without a truck bed cover acts like a bucket that catches the airflow which reduces your fuel mileage some.
Cruise control does save gas as it helps you maintain a constant and steady speed which means you're not pressing the gas pedal in and out which uses more gasoline.
If you mix premium and regular gas in a vehicle then the combined premium and regular gas will result in an octane level that is around somewhere in the middle.
The vehicle will be okay on the premium and regular gasoline mixture and no harm will be done to the vehicle.
If you put 87 or even 91 Octane gasoline in a 93 octane car then the engine could begin knocking and could also be damaged and you would void the vehicles warranty if you have a warranty on it.
If your car calls for 93 octane gasoline then you should use 93 octane gasoline when possible.
93 Octane gasoline does not increase MPG.
Unless your vehicle calls for 93 Octane gasoline then it's not worth it to buy the more expensive premium gasoline.
The cheaper gasoline will give you the same MPG as the premium gasoline and your engine will also be just fine.
Driving the speed limit and not speeding will help you save gasoline.
Good tires and proper tire inflation and proper tuneups will also help improve fuel economy in your vehicle.
A full tank of gas will last longer in that the full tank of gas will go further without having to stop as much to fuel.
However filling up your gasoline tank to full will not get you better fuel mileage.
But it's always a good idea to keep your gasoline tank full when you can to avoid running out of gasoline and to keep the fuel pump cool.
Some ways you can help improve your fuel mileage are.
Get a tuneup, change spark plugs, air filter, spark plug wires.
Inflate your tires to the proper pressures.
Go Easy on the Pedal. Speeding, braking, and rapid acceleration waste gas.
Slow Down. Gas mileage efficiency tends to decrease above 50 miles per hour.
Leave Extras at Home.
Use Cruise Control (When Appropriate)
Turn off the Car.
Check Tire Pressure.
Replace Spark Plugs.
Check the Alignment.
Monitor the traffic ahead and "time" stoplights to maintain momentum and avoid unnecessary acceleration and braking.
Observe speed limits. Fuel economy peaks at around 50 mph on most cars, then drops off as speeds increase.
Reducing highway speeds by 5 to 10 mph can increase fuel economy 7 to 14 percent.