Originally Posted by catdaddy137

i just changed oil , put in synthetic, mpg is better. while on highway i try to go 66mph it is a "sweet spot" for my 08 2.4 auto panel. i drive 270+ miles 6 days a week. i still go faster sometimes. i am most always concience of my engine speed. i tryed old trick yesterday , it does not always work , but sometimes when taking off from a stop , while getting slowly up to speed i let completely off the gas , sometimes this will make the trans shift to the next gear sooner -decreasing rpms and the amount i spend at the next fill up.i have to fill up daily , you can believe i watch everything about my vehicle. the oil , the speed , and the easing up to speed , and letting off , all work. i have tried not doing any one og these things , and it did make a difference. i just purchased my hhr a month ago , so i do not know what it does in the summer. but i increased my mpg from 24 to 27.

Originally Posted by IgottaWoody

Blame Reformulated fuel...cold air and cold fuel makes for more power( a racers battle forever) a heavy foot makes it less.
BUT : extended idlying for warm-ups , different driving styles for bad weather..trying to do burnouts in the snow....running the heater while parking( those darn kids again-snicker).You know..fun stuff,that kills milage!