francisd29

I've been out of the country for almost 3 years now and my car was in storage where they moved it about once a month, and it was temperature controled. Before I put it in storage I remember getting about 33 MPG on the highway and 380 on a tank (with about a gallon left). Now, I can barely get about 270 without having to fill up driving all highway and not in congested conditions at all.

I've tried engine cleaners, injector cleaners, oil change, intake cleaning. Now all I can think of is taking her in for a complete check over. Does anyone have any suggestions before I go and do that, or is that probably the best course, thanks.

Its an 06 SS Supercharged with under 30,000 on it. 60lb injectors, 2.7 pulley, K+N filter after market headers, DP and exhaust. If there is any more info you need hit me up and I'll answer to the best of my ability.

ecot3c inside

iTrader: (11)

take it to a mechanic? unless you had logs or somethings we really couldn't tell you what it is.

G Speed

seafoam? + new gas?

insylem

RUn a compression check.
Also,
Seasonlly the gas changes. So maybe that has something to do with it. Or the tempature is diffrent effecting it as well.

xxxxsh4d0wxxxx

iTrader: (1)

Winter = **** gas mileage. Not just the winter blend gas, but the temperature as well. The car is working harder to get to operating temperature if it's 20°F out versus 70°F.

Fuel filter, plugs, seafoam, clean your MAF, make sure your tires are at 32psi.. ****, that's about the most obvious crap that you can do quickly and cheaply.