Nonsense. The gas price at my local station in PG County MD January 26 was $3.24.9/gal. Yesterday is was $3.89.9. that works out to $0.65 in less than four weeks.
Here’s all I did to boost my mpg (helps boost power too)
K&N air filter (they guar a couple mpg)
Insulated air intake (outside air is cooler than under-hood air, thus denser with O2)
Low restriction exhaust
50psi low profile tires
Mobil 1 oil
Strut tower bar increases handling
Manual trans (+10%)
Leave backseats out
Believe it or not, this PT Cruiser can burn the tires off. And handles very well. Gets 32mpg on highway and high 20s around town. Exceptional for a PT Cruiser. And very fun to drive.