Loosen the rad/coolant overflow bottle cap (WHEN COLD ONLY) to remove pressure build up in the cooling system to reduce coolant leakage until you can get it fixed.
Ya water pump or check hoses for leaks.
SOURCE: chevy tahoe 2002 low coolant light is on. where do you add it
Chevy as most GM cars usually needs Dex-cool antefreeze
But Peak is OK as it can be used to top-off any color of automotive antifreeze including green, yellow, orange, fuschia, blue and red
More info here
http://www.peakantifreeze.com/peak_global_lifetime_5050.html
Also check the system for leaks. If you need to add coolant at least once a month there is a leak.
Good Luck
SOURCE: losing a gallon of antifreeze every 50 miles
try some rad weld added to the resevior it will plug any small leaks that you wouldn't notice
SOURCE: poor fuel milage on a 1993 chevy 1500 with a 4.3
check your timming, it sounds like its out of adj.
SOURCE: 2003 CHEVEY BLAZER POOR GAS MILAGE Just tuned up ,
What grade of fuel are you using? There are many conditions that effect gas mileage. The way a vehicle is driven, is it shifting correctly, flooring it to get up to speed from dead stop also known as Jack Rabbit starts, driving with the defroster on when it isn't needed or the setting just above that can be used. Back in the 90's most car manufacturers made a change to their heating.cooling system that caused the AC compressor to kick in when the selector was set to defrost. This puts drag on teh motor and decreases gas mileage. Build up on valves and low compression in the firing cylinders will cause you to lose gas mileage as well. Do a compression check on the motor to make sure you don't have abnormally high compression or low compression on cylinders and use a bottle of gas treatment in your fuel to clean some of the carbon build up from injectors and valves. Also start using the Mid grade fuel. Not the High Octane in your area. In Texas we typically have 3 choices 87, 89 and 93 to choose from. Low grade is enough to run the vehicle but performance is low as well as mileage. I use the 89 octane for better performance and better mileage. The High Octane or 93 isn't really good as it leads to higher carbon build up on the valves. Also check your oil often and make sure your changing it every 4000 miles at the longest. All of this along with making sure you change the Air Filter every 5000 miles will increase your mileage.
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