Knowing how useful it would have been to me when I was planning the trip around America, I wrote a blog post detailing all of the major costs associated with the trip. Hopefully others will find it interesting.
http://jimthetruck.blogspot.co.uk/2015/01/how-much-316-days-of-travel-cost-us-and.html
I kept track of the mileage and cost every time we filled up with diesel on the trip, which allowed me to get a good understanding of the cost of fuel, and the fuel economy of Jim over the course of the travels. Over the 11 months, we filled Jim up with 7,580 liters of diesel (2,002 US Gallons). The average cost, using the Pesos to Dollar exchange rate we paid at the time, was $1.01 per liter ($3.81 per gallon). At the current GBP to Dollar exchange rate, this is 64p per liter, approximately half of the cost we would pay in the UK today. The lowest price that we paid for diesel was 59p per liter when we filled up in Austin, Texas, and the highest price was 71p per liter, incurred when we made the mistake of filling the tank in Key West, Florida.
Over the 16,602 miles that we traveled whilst I was tracking the fuel economy of the truck, we averaged 8.29 miles per US gallon. This equates to 9.96 miles per UK gallon, or 28.35 liters/100km. This is worse than I expected, and is probably below average for a 14 tonne truck limited to 55 mph. However much of this driving was through extremely mountainous terrain, and so the economy was worse than I see when driving around Europe. The best economy we returned was 9.86 miles per US gallon, when driving between Lincoln, Nebraska and eastern Michigan. This equates to 11.84 miles per UK gallon, or 23.85 liters/100km. Nebraska and Iowa barely have a hill between them, and the roads were so straight for much of our drive through these states that I could have left the cab and made some lunch without the truck leaving the road. The worst fuel economy that we achieved was 7.48 miles per US gallon, achieved when driving between Tulum and San Cristobal in southern Mexico. The road from Palenque to San Cristobal is extremely winding and mountainous and this probably accounts for the poor economy here.
I also recently had the time to take a short trip in the truck down to Dorset an Hampshire, two beautiful counties in the south of England .
http://jimthetruck.blogspot.co.uk/2015/01/a-short-trip-down-to-dorest.html