I have a 94 caprice with the 4.3litre LT1 style V8 with around 300,000 miles. I actually got 32mpg on a trip through Ohio on the highway using the cruise last year . Average around town is about 18mpg with this engine. If you have the 5.7litre LT1 you need to ask someone else.
yes maybe no
in the gas tank..
I get around 21 to 22 on the highway.
9-13 mpg
87 octane
Its designed to operate on regular octane gas.
my 1982 caprice classic(5litre 305 ci v8) gets approx 15 miles to the gallon or 6 kilometres to the litre...
15?
9to11mpg highway
I use Penzoil high mileage in my 105,000 mile LT1 caprice with an AC Delco filter. You can get a 5 qt jug for around $13 at walmart.
It may be your flowter in the gas tank. Check the fuel sending for power and ground.
575-600km c\k1500