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Old 09-05-2012, 09:44 PM   #5 (permalink)
Master EcoModder
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Join Date: Feb 2011
Location: Phillips, WI
Posts: 974

Nameless - '06 GMC Canyon
90 day: 33.45 mpg (US)
Thanks: 186
Thanked 402 Times in 258 Posts
Well, my truck weighs 4000 lbs and has at least as much frontal area as your Volvo..... But I have 2 WD, 5 spd manual, and a 2.8L 4 cyl engine.

You might start with stuff that doesn't cost much - DWL, DWB, grille block, tire pressure, front end alignment, and rear end alignment if your car has IRS. Your 15% to 20% goal is conservative.

What RPM is your engine at 55 or 60 MPH?
The vacuum gauge plus wheel covers helped increase summer 2015 mileage to 38.5 MPG, while summer 2016 mileage was 38.6 MPG without the wheel covers. Drove 33,021 miles 2016-2018 at 35.00 MPG.
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