1997 SHO v8 fuel mileage

[drivebymashing]

i just bought a 97 sho v8
changed the plugs and coils
synthetic atx fluid and engine oil
correct tire pressure
167,000 miles
got the cams welded when i did valve cover gaskets
only getting around 20 mpg
i thought these cars got closer to 30 highway

[drivebymashing]

am i the only one who has one of these cars

[SHOspazz92]

The V8 SHO's are capable of higher numbers on the highway, but under mixed driving they will see lower numbers compared to the V6 SHO's. If your sure something is wrong, check the codes. You may not have a CE light but it may still throw a code.

-Sam

[97shotime]

I have a 97 sho 3.4 v8 have 2 codes in Computor po411 and 1518 secondary air pump is 1 and the other is the runner stuck open can some one help I looked in the intake and found the runners are closed not stuck open there is a cable attached to the runner control box and the cable looks stretched does this sound like I need to replace this control box or can I just replace the cable .

[wheelhopper]

I sold my '99 SHO a number of years ago. It was a great car. When I sold it it had around 66K miles. My mileage was in the 19's with mixed driving. No mods at all.

[SHOlove97]

The best I ever got was 28 at constant highway speeds. Usually (when I was driving it for a dd) I got around 23 with my 97 SHO.