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gas weighs about 6.25 lbs a gallon. So driving around with 6 gallons or less means your lugging 87.5 lbs (38.5 kg) less dead weight around than if you had a full tank.
To put that into perspective, it would require 14855 joules of energy to accelerate that weight to 62 mph (100 kph). In town it would require 3713 joules of energy every time you accelerate it to 31 mph (50 kph). These energy values are assuming a 100% efficient engine and no drag what so ever, so you'll probably end up expending more than 3 times this amount of energy.
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