If your tires are under inflated the resulting "resistance" created will lower your gas mileage. However, if you maintain the correct pressure in your tires it reduces the resistance and improves your car's efficiency. It's also safer.
The size and quality of a vehicle's tires affect fuel efficiency. Bad spark plugs will cause cars and trucks to use more gas.
Having a lower back end will cause your vehicle to tilt up in the front, causing drag. so lower back pressure will cause loss in Fuel efficiency.
Some simple ways to improve your cars fuel efficiency are to make sure your tires are at the proper pressure, that your air filter is clean and that you change your oil and spark plugs at regular intervals.
A clutch in an automatic transmission will decrease fuel economy. A clutch in a manual transmission will increase fuel efficiency.
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Yes, Ford sells many fuel efficient vehicles.
Most cars have a schrader valve on the fuel rail that you attach a fuel pressure gauge to. Cars that don't require you to tee into the fuel line at one of the soft connections.
Standard fuel pressure for a 91 Pontiac Sunbird is between 50 and 55 PSI. This is the idle pressure to allow for maximum efficiency of the fuel injectors.
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Yes it does, like all fuel injected cars. It is in your cars fuel tank, which is likely accessed in your trunk. Most modern cars run on about 45 PSI of fuel pressure.
The absolute best cars in terms of fuel efficiency are the newest fully electric vehicles. As they don't run on any gasoline at all, there is really no comparison for these.