Hybrids are NOT cost effective, maybe people should do some math:

Toyota Prius (Base) - $22,000, 44 MPG
Toyota Yaris (Base) - $12,205 (Prius + $9795), 34 MPG
Honda Fit (Base) - $14,750 (Prius + $7250), 32 MPG

Average Price of Gas: $4 Gallon Regular (AAA)

10,000 Miles Per Year:

Toyota Prius - 227 Gallons, $908
Toyota Yaris - 294 Gallons, $1176 (Prius - $268) = 37 Years to break even
Honda Fit - 313 Gallons, $1252 (Prius - $344) = 21 Years to break even

15,000 Miles Per Year:

Toyota Prius - 341 Gallons, $1364
Toyota Yaris - 441 Gallons, $1764 (Prius - $400) = 25 Years to break even
Honda Fit - 469 Gallons, $1876 (Prius - $512) = 14 Years to break even

20,000 Miles Per Year:

Toyota Prius - 455 Gallons, $1820
Toyota Yaris - 588 Gallons, $2352 (Prius - $532) = 18 Years to break even
Honda Fit - 625 Gallons, $2500 (Prius - $680) = 11 Years to break even

And that is not including any battery replacement costs!

Hybrids SUVs are NOT cost effective, maybe people should do some math:

Chevrolet Tahoe Hybrid - $52,405, 19 MPG *
Chevrolet Tahoe LT - $40,625 (Tahoe Hybrid + $11,780), 14 MPG
Toyota RAV4 Limited - $24,490 (Tahoe Hybrid + $27,915), 22 MPG
Toyota RAV4 Base - $21.500 (Tahoe Hybrid + $30,905), 23 MPG

Average Price of Gas: $4 Gallon Regular (AAA)

10,000 Miles Per Year:

Chevrolet Tahoe Hybrid - 526 Gallons, $2104 *
Chevrolet Tahoe LT - 714 Gallons, $2856 (Tahoe Hybrid - $752) = 16 Years to break even
Toyota RAV4 Limited - 455 Gallons, $1820 (Tahoe Hybrid + $284) = Save $27,915 vehicle cost and $284 a year in gas
Toyota RAV4 Base - 435 Gallons, $1740 (Tahoe Hybrid + $364) = Save $30,905 vehicle cost and $364 a year in gas

15,000 Miles Per Year:

Chevrolet Tahoe Hybrid - 789 Gallons, $3156 *
Chevrolet Tahoe LT - 1071 Gallons, $4284 (Tahoe Hybrid - $1128) = 10 Years to break even
Toyota RAV4 Limited - 682 Gallons, $2728 (Tahoe Hybrid + $428) = Save $27,915 vehicle cost and $428 a year in gas
Toyota RAV4 Base - 652 Gallons, $2608 (Tahoe Hybrid + $548) = Save $30,905 vehicle cost and $548 a year in gas

20,000 Miles Per Year:

Chevrolet Tahoe Hybrid - 1053 Gallons, $4212 *
Chevrolet Tahoe LT - 1429 Gallons, $5716 (Tahoe Hybrid - $1504) = 8 Years to break even
Toyota RAV4 Limited - 909 Gallons, $3636 (Tahoe Hybrid + $576) = Save $27,915 vehicle cost and $576 a year in gas
Toyota RAV4 Base - 870 Gallons, $3480 (Tahoe Hybrid + $732) = Save $30,905 vehicle cost and $732 a year in gas

And that is not including any battery replacement costs!

* The Tahoe Hybrid's maximum towing capacity is 2,200 pounds less than the regular Tahoe. There is also a Tahoe LS for only $37,915.