My car is getting bad Miles Per Gallon... why?

Question

its a 2001 pontiac grand am 3.4L. i have a hard time starting the car when its warm and is also less powerful when warm. my mileage is at about 12-13.. which is horrible. i sometimes hit the gas,, but i dont think anything i do justifies 12-13MPG.... car already had a tune up a couple of months ago. i think it might be a vacuum leak,, but how exactly do i check?
can someone list the whole procedure and signs to look for. I dont hear a hiss when standing still,, but when i was driving near a wall, i heared a broken hiss while i was doing 50mph...

I have no lights and Im not throwing any codes.. (went to autozone to check)... is the machine from the mechanic different?

Answer 1

You need more tuneups!!!!!!! More sparkplugs, and all that stuff.

Answer 2

Volkswagen Lupo a million.2L TDI will get ninety+ MPG. But it used to be in no way imported to the US. The MPG #'s on the ones autos are truthfully plenty much less while pushed like individuals do in 2007. By 1973 requisites (No A/C, fifty five mph, zero-60 in 20 seconds) they acquired 60 mpg. Get an older 1990's Honda Civic CRX HF (High Fuel Economy). Really acquired over 50 MPG! Check out www.fueleconomy.gov The Volkswagen Jetta will get practically 50 mpg, and you'll fill it up at your regional eating place free of charge. You can get a used one low priced and technically get limitless "miles according to gallon" of petroleum. Just ensure it's the diesel mannequin. Good success!

Answer 3

that new of a car can be hooked up to a diagnostic machine and find your problem including vacuum leaks, wires/plugs breaking down, carb/injection problems.

take it to a reputable mechanic that has the electronic diagnostic equipment to analyze.

Answer 4

get new iginition rotor and cap and spark plug wire