i'm trying to buy a cadillac deville (DHT) but i'm worried on the gas cause people are telling me to always use premium gas. anyway, on a 10 gallon gas tank full to empty is about 170 miles to 200 miles. how much would a full 18 gallon tank full go on miles until you refill it up with more gas?|||i have a 1998 deville that gets 28 to 31 mpg on the highway and i only use premium fuel and it has a 20 gallon tank. this is the V8 northstar.|||Cadillac uses a lot of gas. 15mpg IN town.
Never use Super unleaded unless you have a high performance or race car. Super DOES NOT MAKE MORE POWER! It actually resists firing more.
read this, it mentions scooters, but it applies to cars too!!!|||not good on gas
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