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View Full Version : Gas Mileage

Madson26
03-08-2001, 07:17 PM
Anyone know what causes gas mileage to decrease in older cars? I have a 94 SL2 and my gas mileage is about 10 MPG under a new Sl2. I know cars tend to get less efficient over time but I think this is excessive. I changed the air filter and plugs but
I don't know what else to do.
Yobos4vr
03-08-2001, 08:10 PM
well driving habits play a big role. also you could try cleaning the fuel injectors.
Sam96SL2
03-09-2001, 01:22 AM
Might want to check into some new wires if you havent replaced them.
Tenchi Masaki
03-09-2001, 02:50 AM
Anyone know how much heavier wheels can affect gas mileage? What about power also?

Thanks.
- Tenchi
David 93 SL2m
03-09-2001, 09:37 AM
The EGR might be approaching the end of its life. As it fails, gasoline mileage drops, the car hesitates when "coasting" forward from a stop, and eventually the SES light will come on (I think the code is 32). The EGR valve and its solenoid are easy to replace and don't cost all that much - maybe $75 for both at <a href="http://www.IronToad.com" target="_blank"><!--auto-->http://www.IronToad.com</a><!--auto-->

Another simple factor affecting gasoline is the tires. Are they the same size? Do they have the same rolling resistance? Are they properly inflated?