[izanti]

Hey all I have a question about which technique would be better. I'm new here and just so you guys know I have a Dodge Ram V-8 so obviously i'm obsessed with hypermiling lol.So here it is

I do most of my driving on the highway and to save gas I drive around 60-62 MPH and my tach is about at 1,400 to 1,500 RPMS. I have heard that drafting behind a semi will significantly increase gas mileage by about 30%. My problem is all the semis drive about 70-75 MPH and in order for me to draft successfully behind them I have to maintain that speed and my tach goes up to about 1,800 to 2,000 Rpms! I don't yet have a Scan gauge so I cant really tell if i'm really getting better mileage because I cant exactly stay behind a semi every time I drive but when I draft behind a semi the whole way should I see my RPMs go down a bit because of the great decrease in wind resistance?
I just want to know that would I be saving more gas driving at a slower speed than driving at a faster speed behind a Semi? Thanks all