Which gas is better for my 1999 Pontiac Grand Prix 3800 87 or 89 I want better city fuel economy

Asked by May 26, 2013 at 07:08 PM about the 1999 Pontiac Grand Am 4 Dr SE Sedan

Question type: Maintenance & Repair

6 Answers

113,205

Your specs call for regular unleaded. So either will be ok. Here's where I got that info. http://www.edmunds.com/pontiac/grand- prix/1999/features-specs.html?style=13382

1 of 1 people found this helpful.
99,905

Try a couple of tanks of both grades and keep track of your MPG's.

1 of 1 people found this helpful.
98,385

When were your injectors cleaned?

1 of 1 people found this helpful.
7,545

i use 91 for best mpg and fuel additives.

1 of 1 people found this helpful.
365

Well I own a 1999 GTP and I have to run 93 with octane boost of at least 104. I know my car has all most twice the horsepower as a stock GTP and I must say that Fitch is the way to go... FeaturesThe Fitch Fuel Catalyst is a permanent bolt-on fuel enhancer Improve fuel economy by up to 1 - 2.5 mpg Enhances fuel quality by boosting the octane in gasoline Allows the use of lower octane fuel Increases the cetane and lubricity in diesel fuel Better fuel quality delivers added horsepower and torque High-quality fuel helps reduce emissions Reduces number of annual oil changes Keeps injectors, jets and spark plugs cleaner for reduced maintenance Completely maintenance free—install it and forget it Easily installs in your fuel line like a fuel filter Your Fitch Fuel Catalyst is backed by a 250,000 mile warranty DescriptionBoost power, reduce emissions and save at the pump while you’re at it. The Fitch Fuel Catalyst enhances gasoline by boosting octane and bolsters diesel by improving cetane and lubricity. Designed in union with the Department of Defense, Fitch boosts all fuel types—diesel, gas, even JP fuels. Fitch Fuel Catalyst pre-treats fuel before combustion. By running through Fitch’s proprietary metal alloy, normal fuels transform into superior-quality fuels. And, quality fuel means more power, increased MPGs and lower emissions. Plus, it allows premium-fuel engines to run lower-grade gas with no performance loss. Not to worry, the Fitch Fuel Catalyst simply bolts right in under the hood. Each system comes with vehicle-specific quick-release fittings, so it’s easy to patch right in-line with your vehicle’s fuel system. What’s more, your Fitch Fuel Catalyst system is backed by a 250,000 mile warranty.

1 of 1 people found this helpful.
365

Just in case you wanted to see my GTP here you go...

1 of 1 people found this helpful.

Your Answer

Grand Am

Looking for a Used Grand Am in your area?

CarGurus has 1,091 nationwide Grand Am listings starting at $1,599.

ZIP:

Pontiac Grand Am Experts

  • #1
    tenspeed
    Reputation
    7,760
  • #2
    John Saffrahn
    Reputation
    1,610
  • #3
    Tom Demyan
    Reputation
    1,520
View All

Related Models For Sale

Used Pontiac Grand Prix
35 Great Deals out of 2,730 listings starting at $1,200
Used Pontiac Firebird
12 Great Deals out of 814 listings starting at $1,900
Used Ford Mustang
761 Great Deals out of 42,755 listings starting at $1,300
Used Chevrolet Impala
591 Great Deals out of 34,660 listings starting at $1,000
Used Pontiac Bonneville
515 listings starting at $1,799
Used Chevrolet Malibu
1,232 Great Deals out of 78,092 listings starting at $1,500
Used Honda Civic
833 Great Deals out of 78,398 listings starting at $900
Used Chevrolet Camaro
422 Great Deals out of 31,785 listings starting at $2,395
Used Chevrolet Monte Carlo
11 Great Deals out of 1,353 listings starting at $995
Used Honda Accord
1,023 Great Deals out of 62,742 listings starting at $999
Used Chevrolet Cavalier
958 listings starting at $1,000

Used Cars For Sale

2005 Pontiac Grand Am For Sale
130 listings starting at $2,000
2004 Pontiac Grand Am For Sale
247 listings starting at $1,599

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.