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When I got my '88 CDV last Nov the only record I had was when the oil was changed. So put in new plugs and wires and recently got a K&N air filter. Also replaced the fuel filter. My MPG around town is 14.5 and I would settle for 16 as the car has 102K miles on it. My road mileage is good, about 23mpg, but stop and go and idling at lights in the city takes it way down. The only items I did not replace are the distributor cap and rotor and also the O2 sensor. The car idles normal and runs great and I understand if you don't get a trouble code about the O2 sensor, then it is likely good. Autozone here in Orlando carries Conrad cap and rotor that several people have said are good as the contacts are brass. Never heard of this brand and wanted to know if this board may have some info about that brand. I really expected to get better mileage than I do as I only stomp on it once in a while. Appreciate any help.
George
 

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2005 CTS-V, 1994 Infiniti Q45
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Id say do those o2 sensors..... After 15 years of use, they may not be "bad", but they sure are sluggish in changing the mixure...... You should see the benefit instantly!!!
 

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When I got my '88 CDV last Nov the only record I had was when the oil was changed. So put in new plugs and wires and recently got a K&N air filter. Also replaced the fuel filter. My MPG around town is 14.5 and I would settle for 16 as the car has 102K miles on it. My road mileage is good, about 23mpg, but stop and go and idling at lights in the city takes it way down. The only items I did not replace are the distributor cap and rotor and also the O2 sensor. The car idles normal and runs great and I understand if you don't get a trouble code about the O2 sensor, then it is likely good. Autozone here in Orlando carries Conrad cap and rotor that several people have said are good as the contacts are brass. Never heard of this brand and wanted to know if this board may have some info about that brand. I really expected to get better mileage than I do as I only stomp on it once in a while. Appreciate any help.
George
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try synthetic oil. change filter after 1000 miles first time and oil at 5000. then after that filter at 7500 and oil at 15000. actually will be cheaper in long run and engine will run cooler. use low carbon forming oil same as diesal 5w40 or 15w-40 in summer. mobil 1 from walmart at less than $4.00 /quart keeps leaks down. also try tire pressures to 35 for tires rated to 44. check your drivers door panel. should get 28 at 55 and 25-26 at 70. keep your foot out of it for even better. some caddys have instant mileage to help monitor. good luck.
 

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'87 SDV
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Use premium. Shell V or Sunoco's top grade if you can get it. Your mileage will go up about 10% instantly. Of course it's more expensive so it's basically a wash. Replace the O2 sensor, and if you're flush with cash, get an AC/Delco injector kit.

A lot depends on how you drive. Even a slightly heavy foot in city traffic will drastically reduce mileage. Remember too that petro companies formulate gasoline differently in winter than in summer. My mileage slips to 14/21 from October through March, then returns to 17/24 all summer. Of course, I'm driving in colder weather than you, but on balance, you're probably within 1 mpg of normal.
 
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