Question about 1998 Cadillac DeVille

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JUST PUT NEW OIL IN IT AND IT DOESNT WANT TO START I DONT KNOW WHY AND I WANT TO KNOW THE MILEAGE TO THE GALLON IN THE CITY AND HIGHWAY

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Engine oil is different to transmission oil . your engine oil should be sae 40 . dont use gear oil for it is for transmission.

Posted on Jul 16, 2009

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I have got a 2005 Equinox and I'm getting horrible fuel mileage ! Like 7mpg in the city and 17 to 21 mpg on the highway , I've put new tires , battery , original equipment spark plugs and wires and still...


There are many things that could conspire to rob mileage. My first thought was possible transmission slippage. Although your city rating is horrible, the highway mileage is just a little off. 23-25 hwy is correct, 23 for lousy doped California gas, and 25 elsewhere. My guess is that you have slippage but above 45 mph, you are still getting advantage once the converter lock takes effect in overdrive. Just slippage until you reach that lock point.
Start with a full diagnostic of all stored codes in the ODB II computer, both for the engine and the transmission, then an evaluation of your transmission from a good shop.
Good luck, the Equinox is a darned good car,and worth the effort.

Feb 22, 2015 | 2005 Chevrolet Equinox

1 Answer

I have a 2001 isuzu rodeo and my gas needle is broke, how much would it usually cost to get fixed, how many highway miles per gallon and city miles per gallon please?


You would need to check with a local garage for repair prices.
To find your average mileage, fill up the tank, write down the mileage, then do it again at around 200 miles. Divide the mileage traveled by the number of gallons used. I would recommend filling up after you have used about 8 or 9 gallons to prevent running out of gas. You can't go by the federal mpg numbers because everybody drives differently.

Jan 20, 2014 | Cars & Trucks

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After getting gasoline, it increases wrong mileage with camry 2003


One tank of gas is not enough to compare mileage. Or are you saying the computer's readout of mpg estimate is showing less? Try a tank or two of premium and see if that helps. Keep track of gas mileage. Driving techniques have a lot to do with gas mileage, as does long trips vs. short trips, highway cruising vs. city driving. For best mileage, do regular maintenance and keep the car in top running condition-good spark plugs and clean filters and clean oil ! Attend to minor problems before they escalate.
If you want to check actual miles per gallon, start with a full tank. Write the odometer reading down, and go. Everytime you put gas in, write down the amount. When you are close to 1,000 miles from the time you started, go fill the tank and include that amount of gas to your previous list. Now add up all the gas used and divide it into the miles to get miles per gallon. (976 miles/31.8 gallons = 30.69 mpg ) . Only one tank will skew your numbers, might be off cause the tank was filled more to the top than the previous fill-up. About a thousand miles of driving will give you a very accurate figure of miles per gallon for your car.

Jun 21, 2012 | 2003 Toyota Camry

2 Answers

Have installed ac rapid fire spark plugs with 0.44 gap and new spark plug wires. i get 16 miles per gallon and the auto trader specification says i should be getting 20 miles city and 28 highway. what...


The biggest fluctuation on fuel economy is caused by the driver... The listed MPG that they show is under lab conditions. If you want to increase your fuel economy drive the speed limit, dont over accelerate from stop light to stop light. You can also try replacing your stock air filter with an aftermarket such as K&N filter.

Jun 30, 2011 | 2002 Ford Taurus

1 Answer

Gas tank size , gas gage does not work , how many miles to the gallon the grand caravan get?


The gas tank capacity is 20 US gallons, but the tank will really only hold about 19.5 gallons. As far as mileage goes that really depends on your driving habits and the load it carries, just you? more? I would think that your average miles to the gallon would be in the range of 14-16 town and highway.
Here is the EPA ratings, which never match the real world gas mileage.

EPA Fuel Economy: City: 17-20 Highway: 22-26

Mar 17, 2011 | 1996 Dodge Grand Caravan

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I have been logging my gas mileage on my Jeep Grand Cherokee for the last 9 years. My jeep has a Straight 6 cylinder motor, that has given me about 17mpg city and 23 mpg highway. This last summer my jeep...


I would start by pulling a spark plug and looking at condition. With that kind of mileage, has it ever had a valve job? Valve's burn and valve springs get weak, could have a carbon problem. Also compare the brands of fuel you're using, many have changed their formulas - I've noticed it with my own cars. Also have your mechanic do a compression test.

Mar 13, 2011 | 2001 Jeep Grand Cherokee

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What can I expect to be the "best" mileage per


you can never go wrong with what the factory used, motorcfaft avoid any of the so called high perforamce parts, most of this parts will hurt the fuel millage and perforamce unless you change the coils and other sensors in order for this parts to work properly. as for gas mileage when the van was new it was rated at 12 mpg city 16mpg highway

Mar 08, 2011 | 1985 Ford Econoline

1 Answer

Hi I do not know if you can help? I have had the 2.0 Grand Vitara for 2 years and it is a lovely car in just about all respects. However it has appalling petrol consumption, even from new. I average 24...


You are doing better than average on your mileage. The estimated mileage for the 4 cylinder engine is 19mpg city and 26 mpg highway. Your mileage is actually quite good for a 4 wheel drive vehicle.

Jan 19, 2011 | 2007 Suzuki Grand Vitara 4WD

1 Answer

The isuzu rodeo is supposed to make an average of 18 mpg and i´m getting 12 mpg


Driving habits can cause the average mpg to be lower.
Also, note that highway mpg are higher than the city mpg.
And, the posted average mileage is no guarantee that your car
will get that good mileage per gallon

That being said, it's a good idea to have tuneups performed
periodically, or to have an engine analysis performed at your dealer
or local auto service center so that you can determine what parts
need to be replaced to get optimal mileage per gallon.

Good luck to you.

Jul 01, 2010 | Cars & Trucks

2 Answers

I want to know how much good is my gas mileage on my 1998 malibu LS


I have a 2000 malibu ls, and it gets about 27 in city to about 32-34 on open highway.

Nov 14, 2009 | 1998 Chevrolet Malibu

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