[david824]

Originally Posted by TundraHunter

Why are some people getting 19-20 mpg while I only get at best so far with 17.5-18mpg max with all highway driving. I drove from Minnesota to North Dakota last two week for a fishing trip and could only get 17.5mpg, maybe 18mpg with the cruise control set at 70mph/75mph. I am wondering what octane and also what state you are in for those getting 19-20mpg because it is probably the gas also that is giving you more mpg. Here in the midwest, MN, we have at least 10% ethanol added to our gas and I think that plays a big part in why I can not reach that 19-20mpg. I would be very happy if I am getting 19-20mpg though with my 5.7 SR5 TRD DC.

Any thoughts on this gas thing? I drive like an old man so it is not my driving habit that is preventing me from getting the higher gas mileage, I think the gas octane (87/89 octane for me), gas type (/w and /wo ethanol), and gas station has a lot to do with what you get in different part of the country. I mainly use Conoco, Holiday, and sometimes Super America for gas here in MN.

I think that you are on the something with the ethnol thing. I live in an area where ethanol is a big player (Fort Worth) and I'm not seeing the high teens that others are reporting.

I'm 900 miles into my new truck and the best I've seen is 14.9. Though through 3 fill up it has gone up everytime, from a low of 13 and change.